If it's a small block truck, call Hedman and see if they will make you a set of Tork Tube headers for the truck. I had a set on my old 84 D350, and they were 4wd headers. They were some of the nicest headers I've ever had. The tubes started out as 1 5/8, and went a foot or so and then stepped up to 1 3/4. The flanges were 3/8, and the headers fit just fine with a mini starter off of a 92 Dodge van. If Hedman still has the plans and will run a set, I'd be in for buying another set if they're willing to run a few sets off. Hedman says they won't fit a 2wd truck like mine, but I don't mind grinding an 1/8 inch off the passenger side frame rail....lol.