I now have a hot rod. I love the tremec 5 speed over the C4. Drove it for the first time today and it is fantastic. Didn't have to cut the driveshaft, it looks like whoever put in the first C4 must have had it shortened. Buying everything from Modern Drivelines made it go a lot smoother. There were some issues.
The speedometer cable exits the tranny right at the crossmember so had to cut a hole and a slot to get the cable to clear. Had to rework the clutch cable mounting plate. It wouldn't work with my after market power brake booster.

Clearance to my headers is better with the T5 bellhousing than it was with the C4 bell. With the S-10 tail housing on the T5 the shifter came right into the hole in the floor where my C4 shifter was. Much cleaner installation without all the tubing and hoses to the radiator.

During the test run I got it to 60 mph and the rpm's were 1600. Before at 60 I was at 3000. Everything is working the way it should and it's much more fun shifting this thing. Larry