What did not work with the "Summit Racing" brand? In general, long tube headers in a foxbody 99% of the time have minor to major fitment issues. I have not used Hedman in a foxbody, but have used them in many chev c10's and done several different brands of long tubes in a foxbody. Cheaper hedman's were thin with short life on a daily driver, but the expensive ones were heavier and coated with no issues long term. As for foxbody's clearances with any brand can be an issue.