OK so I got a 1991 gt 5.0 from a buddy of mine pretty cheap. First thing I hear to do is get the gt40 heads off explorers. Then I heard that headers won't fit around them. So first thing is should I bother to get these heads. I'm kind of on a budget so might be my option if I can find headers that will work with it. Second I want to do cam and lifter upgrade. This is my second car so its gonna be my weekend driver so I'm not worried about tearing it apart. So if I got the gt40p heads how big of a lift off the cam can I get. So just need some info on that and also what else I should consider doing. Also heard about getting under drive pulleys also.