Headers hitting idler arm

Same thing was happening on my Dart; idler arm was sawing a hole in the one header tube. I removed the header assembly and cut out the hole. Cut a piece of metal tubing in half (may have been 1" diameter but I don't remember) and welded it in with the concave side facing out. Ground down the welds, laid on high-temp header paint and it looks like it came that way. Gained about 1/2" clearance. Same effect as a BFH with a cleaner look.