392 & 8hp70 65 Valiant

DionR said
In theory, a late model motor running EFI should see a fair bit less wear than a similar aged 440 or 360. Just look at all the Magnum motors people pull apart at 200K+ miles that still show crosshatching. Add roller lifters (assuming they don't fail early) and timing chain tensioners and I would expect a G3 to be in way better shape than a 440 pulled out of a Roadrunner in '73. Doesn't mean there aren't failures, only that they have some advantages to a carb'ed motor from the earlier '70's.

Not saying they shouldn't be check. Just that I'm not sure it is like buying a used 440 or 360.

I went with my son when he bought a used K24 engine for his old Honda he wanted to swap in. Seller had 25 or so of those engines on hand in a warehouse. Seller hooked up starter pulled plugs and did a compression test while we watched and before we paid. Every cylinder showed excellent compression and engine ran like new once installed. And since we were there in person we got to pick the cleanest of the bunch they had on hand. The dirtiest of the engine lot was on a pallet to be shipped to someone out of state. While the cleaner ones that appeared to be lower mileage got sold to the local ppl who got to inspect and did cash and carry.

When I was in market for a late model engine for another car a local yard would provide the VIN stamped into the engine. I would run a CarFax and verify yep car was wrecked and yep it was low mile. Sometimes if dealer maintained car records of oil changes. So consider that too. Was not able to do that on the K24 Honda engine because it was imported from Japan no CarFax.