This is a commonly used reference page for engine paint colors:
http://www.pontiacpower.org/enginecolor.htm You may get more responses in the 77-81 Firebird tech section.
It's pretty difficult to keep the paint from burning off on the center exhaust ports or the crossover, but one thing people have done is to put a coat of high temp silver paint on those parts first, then use the appropriate blue color. It will probably burn off eventually as well, but it does slow the process.