Larry, I'm glad you're doing this right before I am. I have a 89 v3500 with the th400/205 combo behind the 454 and the 7 hour ride back and forth to college at 60 mph is getting old, not just for me but for my engine. I bought a nv4500 from a 98 GMC so I can swap the input shaft when I have the opportunity to dump a cummins in it. The trans came with the bellhousing, so I figured I'd get a flywheel for the 2 piece rear-main 454 and a pressure plate for the internal slave cylinder like the 98 bellhousing is set up for. I managed to score the stock hydro clutch/brake pedal assembly off craigslist and I bought this
http://advanceadapters.com/product/5401/50-6910.html
for an adapter between the nv4500 and the 205.
Just curious if you had any words of wisdom before I tackle this.
O, and are your shifter measurements from the firewall? Maybe I didn't read carefully enough but I didn't see where the front of your tape measure is.