Larger 1 3/8" was common in the NP435 on the medium duty truck and AG applications, and does have a larger snout for the pilot bearing. Only requires a different pilot bearing to work with a regular FE crank.
http://www.agpartsltd.com/shopping/productDetails.aspx?i=1053603 I used to have one laying around but I'm sure its long gone. Easy swap for the big input. Input shaft, bearing retainer and pilot bearing should cover it.
Also a larger main shaft/output was available, standard on cab and chassis for a fixed 1350 yoke. And some with a e-brake on the output.
I have been looking for the tall(er) shift tower used in some applications where the shifter cane was extremely long. When used in a pickup and shorter/regular shifter it effectively makes it a short throw. Or so Ive gathered, yet to try it out.
NP435 is a tough girl, wish the aftermarket supported it better.