I ran a small Plym flat head motor with an Isky cam, Offy intake, split exhaust and edmunds head in a '48 coupe with 3.9 rear gears and 29" tall tires and cruzed at 75+mph with no problems and got 20 MPG at 65 mph. Couldn't start in 2nd gear, but pulled strong from 50 mph to 75 mph. Made a believer about 6's of a friend with a 289 mustang.
