I've been trying to find the 'best' rattlecan paint for a GPz engine (satin black bits) and about all I've discovered is that Paint manufacturers websites are pants

The old favorite PJ1 is apparently no good now

Wurth High Temperature Satin (suggested by Z1bman in this thread) doesn't exist anymore (well I can't find it even with Mr Google's help).
Simoniz don't say what temperature their Tough Black (SIMVHT51B) will stand (I did find an add claiming 150°C so that's no good). I've also found it a little too grey when I've used it in the past.
I've found adds for Simoniz Motorcycle case paint (SIMVHT45C) saying it's satin black and good for 300C but it doesn't exist on www.holtsauto.com (the manufacturers).
Eastwood do a 2K in a can (Item #14791Z) but no temperature info.
VHT do four possibles:
SP903 VHT Black Oxide Case Paint - Satin Black 288°C
SP906 VHT Barrel Spray Paint - Satin Black 288°C
SP139 VHT Engine Enamel - GM Satin Black 288°C
SP739 VHT Caliper Paint - Satin Black 482°C
Does anyone know what to pick from the above?