warning on parts from dna motoring

As some of you know I am Building a 1966 Dart Gt. Unfortunately I am having a learning curve that has cost me a few times . anyway thank you all of your help. so now to the message . I ordered headers for a 318 in a 1966 dodge dart gt. from DNA Motoring in july , looked at them but did not fit them because I had other issues. well the driver side does not fit because of the stearing, starter, frame. found out that possibly 273 will fit. DNA Motoring WILL NOT EXCHANGE OR RETURN THEM even in the box . is past 30 days . I think that is just poor business.