hello boyce. i once installed a 455 olds in a 68 gmc. i used the stock bell housing and mounts by using a trans adapter from a company called tci.it was designed to use buick, olds, pontiac, cadillac trans with chevy engines. i just reversed it so the olds motor could be bolted to the chevy bell housing.i used a chevy monza 4 speed.[i know it was supposed to break,but it never did,even when towing other trucks with it].i used full sized olds car headers, and the front mounts were easy to make.remember, the starter is on the driver's side,the clutch pivot[z-bar]will need some fabrication, but i think most everything else is easy to adapt. if you use an olds 350 in yours, you might get some ideas if you go to a salvage yard and find a chevy truck with a deisel engine as these are similar to olds engines. good luck.
