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I am not a fan of headers but the long tube that I have seen require an offset on the drivers side to go above the cross member (where the cat should be) and the passenger side goes under. If you can find a 73-74 cross member then both sides can go underneath...
Ok hope my headers don't angle down. Hoping this works out so I don't have to go to a exhaust shop and then have them try and max out my wallet. Wish I had a pipe bender for 2-1/2 pipe