Idler arm problem? Please help

When I put the 383 in my 72 I had the same issue. From the looks it's rubbing, somewhere I read about this problem and how to solve it. The fix was heat the corner of the oil pan take a flat body hammer and a second hammer and tap in the corner of the pan DON"T use a torch just the small propane torch. Clean off the corner till you see metal rub it with magic marker each time you tap and turn the wheels when you don't see the magic marker your good. It worked for me you can't even tell, it doesn't take as much as you think. I also ground down a little on the idler arm where it was hitting just to smooth it out