Well one reason is the height ,2nd is cost, 3dr is Driveabelity, and 4th is the power difference is not that drastic. And if you talk to the guys in australia that make the heads they will tell you the same thing as he told me when I got my CHI/3V heads that power wise there is not much difference. When a carb is used power difference will be a little wider but low end mid range out of a corner the weiand will be far better, but will still make power in the high rpm 6500 to 7500 range. That is why, Ron
Thanks, P-MAXIMUS
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