Happened to my sc.
Guy left it sit in his driveway for two years with pretty much water in it after he blew the head gaskets.
Engine was junk(good thing i wasn't using it anyways)full of thick scaly rust and siezed solid.
There was no possibly way of even reusing any part of that engine so all it's internals went in the trash.
If you have another engine too use then it's worth it.
If not forget it.
Not to mention,it will need brakes all around(rotted from sitting) and all fluids changed.
The only reason i bought mine was because i had a good drivetrain for it,planed on changing the brakes and swapping the complete interior for black leather(which i had).
I just wanted it's mint never winter driven body.