which version of the 46 heads are these? 69 or 73/74. if they are 69, i would install harden seats on the exhaust and go with the small valve head. The 69 version have smaller chambers, around 72cc. I would run something like a SPC-5 cam (066).
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1979 Firebird Trans Am 301/4spd (Now 428)
1977 Firebird Formula 400/Auto
2007 Grand Prix GXP 5.3L
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