Then you got lucky . I used to swear by headman and hooker for this swap , Heck , I've done enough of them . But with what I went thru with my Warlock this last build I just can't . I blame it on quality control myself . You see what 68GTX is going thru , well I went thru the same issue's as well with Headman , Hooker and one other brand that I can't think of the name right now . Like I said , I settled on the hookers I have in there now and that was the second set that I had gotten of that brand and I still had to work them a lil . There's no excuse for anyone to have to deal with these issues with the money that they get for them . As far as B-Body headers fitting in these trucks ? They don't , plain and simple . And as far as the 70's big block truck headers fitting the 80's truck's ? Your a 100 % correct on that , even though the tech's at places like Summit and Jegs say they don't .