Gerry, I wouldn’t put any extra heat in the frame, it is what it is. If the frame is clapped out, then it’s time for a new one, you can’t turn back the clock.
Part of the process of refinishing the frame is the inspection portion. After it’s sandblasted and stripped, that’s when you go over the frame and look for any cracks or broken welds/braze joints. Especially look over and around the engine mounting tabs.