I agree Fostang, intake and exhaust should be first. Even a Weiand Stealth and a 600 CFM Holley or Road Demon woundn't be too much. The 289 stock heads will limit things quite a bit. He will really need heads, cam, intake, and exhaust to make a lot of power. these things are just all interdependent.
Rev
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'66 Coupe, 306, 300 HP, C-4, 13.97 e.t., 100.3 mph
1/4 mi.
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