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PetChemMan has some good points. However, there are some benefits to using the 71 to 76 engines. The heads will have hardened valve seats and larger combustion chambers (low compression ratio) allowing the engine to run on unleaded gasoline with no problems.
The EGR valve and the AIR parts can be removed with no problem. The AIR holes in the heads can be pluged and you can get good intake manifolds without the EGR port. Early B and C heads will bolt on the later F and Fa blocks..
John
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1966 Ninety Eight Convertible - 425 Tri-Carb, Factory Dual Exh, Switch-Pitch THM400, 3.54 Posi.
1966 Catalina Wagon - 421 Tri-Power, M21, 4.11 Saf-T-Trac, 8 Bolt Wheels
1989 IROC-Z - 5.7TPI
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