Only plus to this is the 350/5.7 is about the cheapest most plentiful used engine out there. And, I don't think the older GM's would be as hard to pull as many newer setups.
That SBC engine holds up pretty well, but I briefly had a "Pontiac" (rebadged Chevy-something) with the 307 Small Block Chevy and it was tired. After all, swapped even for a used mower I was asking $45 for... How bad could it be, didn't smoke. Well, till I added oil... I left it at a friend's lot w/orders NOT to sell it, but he did, As Is, fortunately, and the kid was back in a few days, whining about a blown engine.
If God's Your Co-Pilot Move Over, jd
2003 Jayco Escapade 31A on 2002 Ford E450 V10 4R100 218" WB