Virtually all small block V8's from 1958 or so when they started using side engine mounts on the passenger cars to the early 90's are pretty much a bolt-in swap regardless of displacement. The small block 400's use externally-balanced crankshafts that require special harmonic balancers and flywheels, but they still have the capability of fitting the same mounts.
Jerry

"It is better to be silent and be thought a fool than to speak and eliminate all doubt!" - Abraham Lincoln
Cringe and wail in fear, Eloi- - - - -we Morlocks are on the hunt!
There is nothing noble in being superior to your fellow man; true nobility is being superior to your former self. - Ernest Hemingway
Love your enemies and drive 'em nuts!