I want to swap a big block into a 87 4x4 truck (1 ton) that was orignally equipped with a small block. I know all of the small block engine mounting brackets from the small block will "physically" fit the big block, however when you go to the GM dealer to start looking up part #s they are not the same. Furthermore, I remember reading a magazine one time which talked about chevy cars from the 60s, the magazine stated that the motor mount brackets were not the same. By not using the correct brackets you would not have the correct drivetrain angles which could cause problems. Any thoughts on the subject?