I'm going to post what I did to mate my nv3500 to my 5.3 since I wasn't able to find any reliable info when I did my swap. I bought the flywheel from oreilys. The pilot bearing is an 43.3 mm od with 15 mm Id that is a special bearing that I only been able to find at NAPA. This fits in the end of the crank with no spacer of any sort. The release bearing may be hard to find, but I found one on ebay with this part number 1377c. I used my stock clucth and pressure plate from a 95 chevy truck. With these parts I didnt use any sort of flywheel or pilot bearings spacers and cost less than $100. If you find this useful let me know.



P/N
Flywheel Oreilys $60 NFW1050
Pilot Bearing Napa $20 6302-VSP43
Release Bearing Ebay $20 1377C
Clucth Stock
Pressure Plate Stock