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For a G/M Headman headders have the best fit all around for Camaro's Chevelle,s and Nova,s . AlexJudging only by the picture I suspect it will be hard to change spark plugs and route plug wires without "altering" the headers.
My son called vendor (different headers) and asked about plug clearance and was assured they would clear. NOT. Had to dent several tubes. Stock/original Chevelle clutch linkage hit a pipe.
I hope someone with direct experience with these and answer your questions.