In 1958, in Abilene, Texas, my friend Al--now retired in Georgetown, farming pecans--built a '29 Model A roadster, channeled seven inches, fenderless, with 7.00 x 16 tires on the rear, off my Lincoln Zephyr, and 4.50 x 21 on the front. The stock four=banger had a Burns manifold, a milled head, and an open exhaust. Although it was definitely constructed in the 1950s, i should say that it was fairly typical of the genre you are describing.
In 1959, in Arkansas, i bought a fenderless 1931 Model A pickup, with welled fenders sitting in the bed, for $40.00, drove it to work and to school, and managed to bring it back to Texas. We built an engine bored to four inches for it before i had to let it go.
i keep hoping that some day i'll have another four-cylinder. In a light chassis, there is nothing quite like it. Even without any increase in power, we are well-advised to find a later v-thing rear end, not only for the hydraulic brakes but also for the axle keys! (We haven't lived until we've sheared an axle key on a lonely dirt road in Arkansas, late into the night.)
God's Peace to you.
d
Inliner #1450