I think that the frames are the same. You eill need the V-8 front mounts and the correct bell housing, the GMC had a different bellhousing because they used a Pontiac V-8 from '55-'59, they have different bolt patterns.I think the clutch was an 11". As far as I know, the GM crate engines still have the front mounting holes om all the engines-small block and big block. My GM Power Catalog is a few years old, however, that may not be so now. You have a small block in it now, so there should'nt really be any suprizes in the swap.
