Leaking exhaust flange

I have been putting up with this too long. The flange for the head pipe to the exhaust manifold on my dart is pissing me off now. It is a 65 with a super six and the flange has not been flush with the manifold since I had the exhaust dozen years ago. Every 3 months or so the damn ticking noise starts and I ignore it for a while and then put on 2 gaskets and the cycle starts again. I don't drive it a lot but when I do my power steering conversion in the next few months I wold like to fix it. What are some recommendations? I was thinking of taking the gaskets off and bolting it back together and heating the pipe in an area near the fire wall red hot figuring the stress of the misalignment would configure the pipe properly. I won't take it anywhere because when I do things don't get done right.
Any other suggestions on a better way?
Thanks-Howard