My "CRUISER" is a 1937 DeSoto convertible. It has an S-15 motor with a Nicson 2x1 intake, factory aluminum head, split exhaust manifold, and dual exhaust. The ticket on these cars is to get the RPM's down which means an overdrive transmission or drop the rear end ratio. I also have a 1933 DeSoto without overdrive transmission. When I went to replace the tires I went with a taller white wall. Coker offers two different diameters of 15" wide white wall tires, one is 24" and the other is 27". The taller tire helped a bunch and in my opinion fill the wheel wells better. My '37 has an overdrive and it cruises easily at 65 mph turning right at 220 rpm. For drivability, one of the biggest improvements I made was switching to modern gas shocks, really improved the handling. Braking can be an issue, but for those of us old enough one of things we were taught in Driver's Education class was to think ahead and try to anticipate other driver's moves, which can help keep you out of trouble.