[goodyear1984]

well u didnt say what heads u have now or what your has done to it so im goin to guess its a 302 ho from a fox body stang
ok there are a few 4v and 2v heads you didnt say what u had in mind,some have compustion cambers that will lower your compression way too much,so i would only use the small chamber,the 2 v does have a little smaller valve but both are too big.unless you plan on reving this motor up higher and put tall gears in the rear end and a single plane intake and bigger carb and cam,then this swap isnt for you.you would notice all topend power and would be a slug in the lower to mid range power