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It is not a Corvette engine. Not a Corvette tranny either.
L98 from a Camaro /Firebird ;
has mount on trans for F-body swing arm , small cap dist , fuel lines to drv side ,F -body exh manifolds and low mount A/c compressor
Not a '90 either because it has early style throttle body , runners and oil pressure sensor
It is a 1987 L98 or LB9 out of a F-body. It has centerbolt valve covers (1987 and newer), cast iron heads, 1987 serpentine pulley set-up, F-body exhaust manifolds, and transmission. He says it is a 5.7, but the only way to tell for sure is to have him take a picture of it.