Afermarket heads? Nope.

Heads, cam, high stall converter, right compression ratio, good high-voltage distributor. Then you've got a chance.

Something that has been repeated time and again on this board. An engine is a system - not just a collection of parts. Put 'em all together, and you've got a motor. Screw up one of them, and you've got a door stop.

You can do anything you want, but stand by for the "told ya so."