Have you checked out Hedman Hedders #75340. 2in. primaries,3 1/2 collectors (slip fit).Summit has them listed. Hedman also lists a set for 440 only vehicles with Indy heads.Don't have any personal experience with either but the quality of their weld up kits is good.Built a set of 2 1/8 tubes for my tube chassis Lancer. That was difficult, but stock chassis cars would be much harder with all the obstacles.Not even suggesting it.Building headers is a skill. I probably will never do it again. They turned out nice, but me and my son burned up the better part of 3 weekends before we were done. Bill