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You would probably be better off buying something with the 289 in it unless you really, really want a hairy-chested full-on race engine, which is what the 427 side-oiler basically is, requiring the requisite amount of maintenance. The 289 is a jewel that can also be coaxed to a scary HP level. Small block Chevys will fit too, if you're not a purist.
I'd go the 289 FIA route in a heartbeat. Much more streetable.
Windsor