I would do a compression check or even better is a leakdown test. If the rings/pistons and valves/seats aren't sealing, then no matter what you do it's not going to run right. Make sure the engine is mechanically sound and then go from there.
Kevin
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1996 SVT Cobra #522
1973 "Q" code Mach1
1967 F-100, 5.0 Stang engine, ported heads, F-303, Mustang SEFI, 1988 Truck 5-Speed, 9-inch w/ 4.11 Detroit Locker
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