[dragula81]

John,
Good luck with any "rattle-can" header paint. If you don't take some precautions, it's going to burn off very fast;

1. Use it LIGHTLY. No thick coats, only a couple of very thin coats.
2. Prep the h*ll out of the headers; NO rust, oil, factory paint, etc. can remain (you should be fine since you sandblasted them).
3. Don't install them on a new engine during the break-in. Use some old headers or just exhaust manifolds until the engine is broken in and then install the headers. A new engine has unusually high exhaust temps due to new friction, improper timing and carb adjustments.
4. Don't run your carb too lean. This causes high exhaust temps too.

I painted my intake with a "cast-iron" gray from NAPA and have used this stuff several times on aluminum intakes AND cast iron exhaust manifolds and it has NEVER burned off. It's not labeled as a "high heat" paint, but has worked good for me and it looks good too. Here it is on my new engine. (It's just resting on the engine in this pic. I was waiting on a new valley pan to come in.)

Drag

http://webpages.charter.net/dragula7