had Headmans on my 360 had battles myself,now i have tt'i due to pitman arm issue,that last bolt i would slide the header with the bolt taped to flange,there is also one other bolt that is a pain,had to grind off the head of a wrench and that helped
To be honest I went with tti's due to going with a fast ratio steering set up,also not a big block, have them installed which went smooth.the tti's are expensive but that's what they do mopar headers and have good reviews. Just as insurance I did get a set of reflex gaskets.