You have to be INSANE to have long-tube headers on a big-block A-body Mopar!
Have you considered that just because the starter only clicked, that it might not actually be a faulty starter? There are are several reasons to get that result only one of which requires the starter to come down. I mean, Ima thinkin' because of the difficulty required, you must have done your due diligence. Except I couldn't find it in this thread.