ON BUYING A VORTEC
Another opinion on sourcing engine(s). I have / will have three GM V8s in Cruisers - an FJ62 (two motors) and a BJ73 (currently in conversion). The motors were a 5.7 liter Gen II engine (take-out by prior owner), a 5.3 liter Gen III (L33 aluminum HO take-out) and a new GM crate motor (LC9/eRod with 4L65E tranny).
1- I have personally observed two salvage yard take-outs that experienced "fails" following installation. Would not go that way, even if 'guaranteed" due to time, effort and/or expense in pulling out the bad motor and replacing with second used unit.
2 - I purchased a pre-screened motor from Brian at BD Turnkey, with clean-up, run-in test, ECM flash, harness, pallet and shipping. Paid a little more (not that much) for a clean motor ready to drop in. I would do it again - great little motor with only 79,000 miles. Brian has his xxxx together, gives great service, but if you check his site, good motors are hard to find - especially 6.0s.
3 - When planning the BJ73 re-motor, I looked hard at the Gen III market for used and remanufactured motors. Used stock with good histories, low miles, etc. are getting pretty expensive. Reman crate motors not cheap either - while the LC9/eRod is simple, turn-key and carries a 24 month GM warranty. Aluminum block, 326 hp, etc., etc. And if you have smog to deal with, can easily pass California inspection. Here's a video on a eRod motor in a California 60, installed by Torfab last year.
Just my two cents....