like bill said. you really gotta make sure that the frame is straight. even if you get it looking straight ive seen cars that are just never the same again. sh!t just doesnt line up or whatever. sounds like its not too bad if the fans arent hitting the headers but that still doesnt mean anything. pictures would give better idea.

if the frame is bent bad. honestly i dont think its worth all the work. better claiming it totaled and getting another gp