I just use regular Hi-temp engine paint for my engines, it can be found at most automotive stores, advance auto is where I got mine. I am unsure how long it takes to dry, but I can read the can and get back to you, I never went by it and had my engine running less then a week afterwards with no problem.
1981 DMC DeLorean
1966 Thunderbird 390 FE HI PERF T-L (Red)
1966 Thunderbird 390 T-L (Black)
1950 Buick Special
1997 Subaru Impreza AWD