I agree with above posters, mid-seventies 302's were most deffinately NOT the same as later 5.0's, just as well, I would side with turbo nasty and look into finding a locally available '93-98 Lincoln Mark VIII and grab the powertrain, refurbish as necessary and serve into your highboy, 4.6 DOHC engine is a pretty nice piece from the looks and power departments, good luck.
Kevin.