[gmc684x4]

Even if you do not do a cam swap replace the intake gaskets as they are prone to fail and leak

Van diff is a fair bit wider then a 72 i am guessing eaton diff, a good swap diff is the tried and true 14 bolt out of 73 87 trucks

you can do a disk brake swap easy on the 72 or a 1 ton drum brake swap from a 14 bolt to it

Look up Lt1swap site he has posted how to re work your wiring harness there


I was going to do this route I picked up a 99 express van last year for its L31 Sold it and the 350 in my 72 C20 and picked up a 5.3 and a 6 liter LSX for swapping kept the van 4l80e

The L31 is a Gen 1 small block the only difference is it takes a 1 peice rear main flywheel