I think you're right about the auto sucking power. I believe my C-4 costs me 25 HP. My 2500 stall TCI and B&M shift kit actually showed no lower et's at the track and no more mph. I still kinda like my C-4 but mostly for sentimental reasons and it does launch well and shift hard now.
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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