1bbl Aluminum intake

Just unscrew the whole thing. You almost certainly won't crack anything, but if the manifold is in such fragile condition that unscrewing this temp sensor destroys the intake, you've just dodged a bullet (doing the full install to have to do it again).

Jos51700 is right about leak-checking—these 2-piece intakes have their advantages (light weight, better fuel distribution). Some of them were porous at the weld bead, though most of those went for scrap long ago, but it's still worth some prep to ensure you don't have this problem. See here and here. The lightweight construction also means they can tend to crack in the floor area above the exhaust hot spot, so check carefully there.