I have considered doing the T5 conversion, but for now I'm concentrating on trying to build my truck in the late 50's drag race/dry lakes push truck style. So I'm trying not to use any parts newer than the late 50's or early 60's.
So, are there actually any other benefits to be had from any later internal parts other than the quieter first gear? That doesn't really seem to be enough reason to go to all of the trouble of rebuilding my existing gearbox. It only has 37,000 miles on it and I kind of like the whine in first.