I'm now thinking of a Tremec 3550 swap into my '70 mach 1. The car is is original with an FMX. I am familure with some of the details of the swap, but there are a few different ways to go as far as clutch set-up (factory linkage, hyd, or cable), weather or not to use a spacer or shorten the input shaft, and crossmember selection. using the original placement of the shifter and console is a must. I would appreciate the input anyone might have experiencing this swap. Thanks Jim.