Jumping back in, motor has an airsail on it and I was seeing temps pushing around 430 and up. I started to feel what might have been really light soft seizes and started getting really nervous about it.
I'm getting the tank brazed right now anyhow as no one has been able to come up with a clean replacement frame, so the point is moot for a few days anyhow until I can get it all back together. I'm going to pull the head and check the cylinder in the mean time. I like the idea of doubling up the base gasket as well, might try that and see what my compression numbers look like.