Header Questions for a 73Duster

I spoke with a guy at dougs a short time back and all he'd tell me was that it is a problem with linkage that keeps them from fitting a 73. I have looked everywhere for some that will fit, and just decided to go with spitfire anyway. I don't race, and the short ones should run fine up to 5600 and that's my top, so since my car is pretty low, lower than stock, and I can't afford the tti's I think it makes sense, for me, but I hope you find some that fit and flow AND don't break the bank cause I'll be watching!