I finally found a cast iron Fenton exhaust manifold for my 223-I6. It has two issues that I found after I started cleaning it up in the glass bead cabinet. There is a hole in between the #3 & #4 exhaust runners, and not just a tiny one either. And a pin hole on the bottom of the #2 exhaust runner near the cylinder head. I do have a welding shop a few hour drive from me that has done other work for me and am very pleased with their workmanship. The small pin hole should not be a problem to fix, the other hole could be a problem. How critical is that to the performance and exhaust pulse for that to be sealed shut? Does anybody have a video of a 223 with a Fenton manifold running and driving? I thought I would put a video up after I got mine dialed in.