The FelPro 1233 gasket is a good choice for RAIV sized ports. If these are aluminum heads and a quality manifold they will fit great. If you have standard ports and a cast iron manifold (or an aluminum manifold with ports that don't align all that great) you might check that the intake seals properly against the 1233 gasket.
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Mick Batson
1967 original owner Tyro Blue/black top 4-speed HO GTO with all the original parts stored safely away -- 1965 2+2 survivor AC auto -- 1965 Catalina Safari Wagon in progress.
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