It'll probably be the Fel pro 1250 intake gasket. My heads were opened up to the 1250. I've currently got 1262's on it though because I blew out my silicone end seal and noone had a 1250 that day so I figured that at least it was big enough. works fine.
Just wait until you get the heads and then measure.
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393W: AFR 205's, hydraulic roller, TKO600.
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