I am building this old PYRO Packard kit while paint dries on other cars. This is a long one, as the 1:1 car had a 134" wheelbase.
I used a plastic narrow chassis from the parts bin? and stretched it. BWA slimcan motor, slotting plus guide, Eldon wheels on 1/8" axles, TRU tires front and rear, 9/27 gearing using slot it parts. (drilled crown).
I have been building a whole series of these 30s cars, and I use high rpm motors, but run the track at 7.7 volts. the cars are Very fun to race, and a crash is usually just a deslot, with no harm to cars or scenery. I have been experimenting with low voltage and big motors for a while now, and I really like the drive it gives me in all classes of cars. Anyway, here is my 734 so far.