The tops of 47-551st Chevy/GMC panel trucks work well on 33-35Std Chevy sedans and probably other cars as well. We used the top of a Pinto/Bobcat station to do the top on my brother's 32 5W coupe. Toward the front on the roof, gutter to gutter on the Pinto does the 32 windshield to rear.
If you read Flathead Jacks website, he says 'A streetrod is a Ford with a Chevy motor and a can of wax in the trunk. A hot rod is a Ford with a flathead motor and a box of tools in the trunk'. In regards to my post above on the roof filler metal; has anyone had trouble trying to weld the newer vehicle metals (different metal composition) to the older vehicle metals?