The bellhousing from a 57 235 will definatly fit. For years I used them in my lakes race cars. I like the 55-57 for the double bolt slanted mounts.(not like the truck) The 55-57 car transmissions did not have a rear mount. They used 2 up front and 2 on the bellhousing. Early pickups will work but I did not like the mounts and mounting for the "kick" starter.
I used a Muncie, T-10 and Saginaw 4-speeds and they all bolted up. I now use a Buffalo plate with a Lakewood or McCleod scattershield.
I have used both 168 and 139 tooth starter ring gear flywheels with both setups. Good Luck
