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No disrespect intended...BUT GAS was quite a bit different back in the 70's and that combo will likely NOT provide the same performance today...and with todays gas, Vacuum advance is moot, Time your car properly, change plugs Filters often, stay out of the pedal and your mileage will improve

I guess you will have to decide WHO you are going to believe.... the people that MAKE & SELL the headers OR the guys on here that have physically tried every header combination for an A body and engine combo known to man........ it is YOUR call so give up the WHAT IF'S & WHY NOT's and decide WHO...

in MY experience...it will explode immediately after you hear a funny noise that sounds like metal on metal......engines are different that human interaction, with engines ONE TOUCH and the dance is OVER!