In 1935 Pontiac introduced a 208 cid flathead six producing 80 horsepower and continued that same engine through 1936. (In 1937, displacement increased to 223 cid.)
208.0 cid
80hp @3600rpm
150 ft/lbs torque @1600 rpm
6.2:1 compression ratio
Carter W-1 carburetor
As i recall, somebody ran one of these engines in a "lakester" at the dry lakes and at Bonneville in the early 1950s, so they could be made to run hard. Unlike many engines of that time, this design has full-pressure oiling to the crankshaft and inserts in main and rod bearings.
Contact with the Pontiac-Oakland Club International and the advertising in Hemmings Motor News would be useful places to begin to look for parts.
God's Peace to you.
d
Inliner #1450