I had the same issues with mine from the head stud kit to the stainless whole motor kit.....a lot of the lengths were wrong...I called arp on the head studs and had to order 10 new studs that are 5.75 long instead of 5.5 and now I have the 4-5 threads on the head studs that are needed. The rest of the kit I monkeyed around, cutting off length etc to make it all work, nobody will ever know but me and they sure look sweet!