Jerry: it is going in with an S10 rear end, so the whole truck will be limited to light duty use anyway.
Which is fine, if that is the direction he wants to go. I would rather see an old truck get modern upgrades and be driven than rot into the ground bone stock.
EffDubya: As I recall, the large truck frames are a different width than 1/2 and 3/4 ton trucks and they will not work off the shelf.