I have a 1950 gmc 100. Came with a 216 and the block broke. Went on the endless search for a full pressure 235 and came up short. In the process i left a message for a guy i found on the internet (i think his name was tom langdon?). So i wasnt able to find a 235 and i bought and started to build a 283 v8. During the build i get a call from the machine shop that machined my 283 and the old man tells me that he just pulled a full pressure 235 out of some old truck that he put a v8 in. So im like hells ya ill take that and ill even pay you to build it for me (the machine shop is more or less a dad and sons and granddaughters that all drag race and build race cars) so i convince my wife that i need something to put the 283 in and she took the bait and now i have a 55 belair. So uesterday i get a call from the guy i left the message with. He just says hey i dont check my messages very often (like 2 months) but anyways i was wondering if you found a 235. And im like oh ya... found one. Hes all is it a gmc or a chevy?? Im like i dunno... its gm arent they all the same? And he just starts laughing and hes all... no, they arent. Im like what you talking about? He starts telling me all the reasons why it wont fit but all im thinking is i need to find out what i just bought. Buuut the guy that is building it is busy drag racing. So.... exactly how screwed could i potentially be?