TTI coated headers for a small block

Sorry if this has been covered before, if so I missed it.

I have had the coated TTI's on for almost two years now. I noticed when I pulled my stroker motor last month, and replaced it with the 318, I couldn't get the #7 tube to budge. I whacked the flange with the plastic mallet a few times, it was rock solid.

I didn't want to destroy it, so I ended up leaving it. I soaked it in "knocker's loose" for a couple days, and it wouldn't budge. At installation, I had added anti seize compound to both surfaces.

It would seem that now, I will have to pull the drivers side torsion bar, to remove the header. Anyone else have this problem? Suggestions?