I just had a local muffler shop cobble up an exhaust for me, and the rear shackles for the front springs are bent inward (pass. side). They obviously need replacement, but are RIGHT next to the cheapo headers I bought from Summit. Even after I replace these shackles, they will still be less than 3/4" from the headers. Should I worry? Also concerned about new rubber spring bushings being melted from the heat. HELP!