(To add to what Richard and Michael have already posted) I believe the name of the venue was Marston’s Mills (not Hills). The event was one of the races organised by ARCA (Automobile Racing Club of America). Here’s a piece giving the general background on ARCA, which mentions Marston’s Mills:
http://blog.nyhistor...can-car-racing/
It gets a mention in a couple of earlier threads:
’Climb to the Clouds’ ... by the Colliers
Allan Brown's The History of America's Speedways, Past and Present, gives the following information:
Sleepy Hollow Ring - Tarrytown (Pocantico Hills)/ located in a farmer's field. 3/4 mile dirt road course (7/08/34)(7/14/34)(7/29/34)/ had 10 corners
the sports cars were refered to as foreign midgets
these races were the first ARCA races/ later to become SCCA
the races were organized by Miles Collier, son of Barron Collier.
Wayland Circuit - Wayland - 1.0 mile dirt road course (10/07/34 - 11/17/35)
Briarcliff Manor - 3.17 mile city street road course (11/11/34 - c.6/23/35)
these races were run by the American Auto Racing Club.
Marstons Mills - paved city street road course (6/29/35)
Cotton Carnival Road Race - Memphis - 8.0 mile road course (May, 1936)
More to follow.
and:
Willys race car
The car in the first post in this thread certainly appears to be one of two built in 1935 to run in ARCA road races.
Langdon Quimby, the 1934 ARCA Champion in a stripped down Willys 77, partnered with Arthur Pickett, the New York distributor for Willys-Overland to build a team of somewhat purpose-built cars for 1935. Quimby’s 1934 car (we’ll call it #1 as it was both the car that carried the #1 number and was also the first of the Willys cars built) was used as the basis for one of the racers while Pickett came through with another(#2.) #1 maintained a 100” wheelbase (I’m not sure if this was the stock wheelbase for a 77) but #2 was shortened to 92”. Barron Collier, Jr., who probably introduced Quimby to Pickett, coordinated the transformation of the cars into racers: the bare chassis were re-bodied into sort of upright, two-seater Indy junk formula roadster form at the General Sheet Metal Company in NY while significant engine modifications (in the form of new aluminum cylinder heads, and some hot rodding) were performed at Zumbach’s.
Collier drove the #1 car while Quimby chose #2 (ARCA number 11) for the season. I am not sure if any other modifications from stock form were made to either car.
Results for the Willys Team in 1935:
ARCA Grand Prix of the United States of America – Briarcliff Manor, NY – 6.23.1935
#2 L. Quimby: 1st Place
#1 B. Collier, Jr.: DNF (Fuel line)
ARCA Cape Grand Prix – Marstons Mills, MA – 6.29.1935
#2 L. Quimby: 1st Place
#1 B. Collier, Jr.: 2nd Place
ARCA Climb to the Clouds – Mt. Washington/Gorham, NH - 7.14.1935
#2 L. Quimby: 2nd Place
Early in the summer of 1936 the cars were again re-bodied by General Sheet Metal, this time into the single-seater form. Preparation of the cars was done by the Collier/Rand "Motor Sport" organization. The chassis maintained their ARCA numbers from 1935.
ARCA Climb to the Clouds – Mt. Washington/Gorham, NH - 7.26.1936
#1 L. Quimby: 1st Place Overall
#2 Bob Heller: 4th Place Overall
ARCA Round the Houses Race – Alexandria Bay, NY – 8.15.1936
This was a handicap race with the Willys both being placed at heavy disadvantage to the rest of the field.
#2 B. Heller: 2nd Place
#1 B. Collier, Jr.: DNF
After the 1936 season the #2 car was sold by Pickett to South Africa. The #1 car (now ARCA number 7) would go on to compete for one more season before it disappears from competition records.
ARCA Climb to the Clouds – Mt. Washington/Gorham, NH - 7.11.1937
#1 Miles Collier: 5th Place
ARCA Round the Houses Race – Alexandria Bay, NY – 8.7.1937
#1 B. Heller: DNF (Crashed; car ran in the race as number 3)
This marks the last mention I’ve found for these two cars in ARCA competition. Some of the regional notes and newsletters list cars for sale but I have yet to see any that mention the #1 car…Joel Finn notes that the Collier “Ardent Alligator” Riley Special ended up with the engine from the #1 car at one point.
Interestingly enough there were at least two other Willys 77s that ran in ARCA races, one run by Bob Love, the other by Eb Lunken.
(Info from various ARCA publications as well as Joel Finn’s American Road Racing-The 1930s.)

Ad from the back of the ARCA Journal, Vol. II, No.2, 1936

Tom Dewart leading Bob Heller at A-Bay.
I hope this adds some to the discussion. I will add more pictures as soon as I scan them.
Cris