I was told yesterday if I don't use 4-7 swap headers with the 4-7 swap cam I will loose a lot of tq I was wantin to kno how true that is I seen that they do have special headers for that but about how much tq/hp will I loose I have a stock 400 sbc with sportsman ll heads and the swap cam idk the lift but it's not a huge lift and I have a holly 750 4 barrel dual feed non double pumper on factory ignition