TTI header woes

It's a real shame companies can make headers that fit Ford, GM, AMC, and a host of others with no fitment issues, but no one can do it for Mopar. Some fit good, some don't. And that's true even buying the "best".

Is it the headers or inconsistancies from Mopar ? My ragtop rear end is off by 1/4". I know thats not header related but who knows about the front of the car ?