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If you know and TRUST this guy, maybe. If you don't know him at all, pretty risky to not know anything about the engine.
If you are thinking seriously about this, AT LEAST take both valve covers off to look at the valve train and check the oil for any fine particles (or worse) that are floating in it.
It's really a shot in the dark I don't know this guy he claims he's a mechanic and motor is solid etc motor was just rebuilt and never installed and he said I could hear it runing on his test bench
I guess it is risky you never know if its gonna blow up
But for 1500 is it worth the ridk
I believe C3 engines have a unique, Corvette only water pump, so you may have to move your old water pump onto the new engine, or buy a Corvette water pump, in order to have all the accessory pulleys line up, the radiator fan line up with the shroud, plus the pilot hole in the fan is 5/8" on Corvettes, for some reason, as opposed to 1/2" on everything else. Also, if it's a newer engine with a one piece rear main seal, you'll need the flexplate that goes with it, if I'm not mistaken. That's about all I can think of, a small block chevy is pretty much a small block chevy.
I can't believe nobody has picked up on the fact that the engine is "Bored .30 Over". Wow, let's see, according to an online displacement calculator, that makes the engine displacement 404 CI, with a 3.48" crank. Drop a 3.875" stroke crank in, and you've got a 450!
Obviously a typo, just having a little fun with it.