[67ChevyRedneck]

My truck was an I6 with a manuel 3spd and I had to move mine back. Best thing to do is get everything in, mark and drill holes as stated above. My crossmember did use what I think was the original rear holes for the holes for the front of the crossmember, so I only had to drill the back holes.

Edit: where the trans mount goes will also depend on where you mounted your engine (I6 or V8 location, or custom mounts)