I have some hedman headers #69090 which are for 2wd. I read the tcase crossmember might be in the way? Is there some way I could get them to fit? Anyone used these likes/dislikes? I have '77 blazer. (and yes I know I'm in CA and there's problem there ). Also what should I use to clean these up a bit? I have two sets and one has very light surface rust in some places and the other set is covered in rust (surface) on the inside and out.