Denting headers for clearance.

I have a question about the best way to dent my header to fit an extremely tight fit between my mini starter and my torsion bar. I had Michael Schumacher modify my drivers side tri y header I bought off a member on this site. I have to give kudos to the member that sold me the slightly used tri y headers it was seamless. Michael Schumacher took the drivers side header and mocked it up on a real BB a body 4 speed car much like mine to get an accurate fit for modification. The problem is that I put it on my 67 4 speed GTS to test fit and it barely touches the mini starter and the factory torsion bar in the car. I’m moving to bigger bars 1.03 so I need to ding the header in specific areas to have a little more room. Is this do able without cracking the header or major damage? I thought the best approach would be to heat the areas up with a torch then hit it with a mallet until it has more clearance. I’ve never done this before and the tri y headers are quite thick guage steel. Check out the pics you can see the areas where it touches.

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