It would be interesting to see how it goes on a hot day (40�C +). I have a similar setup, hopefully it will be enough.
Not quite 40� out today, but getting closer...and let it idle for 20 minutes in the shed..then drove around for 15 minutes (was just checking another little thing I just did) then idling for 40 minutes again sitting still in the shed...
You can see the outside air temp on the thermometer and as before the engine temperature is perfect.
Oh,and used some other heat shielding around the rear header tube closest to the fuel lines and fuel pressure at idle is rock solid (as it was when running it for shorter periods of time or on cool days) so that hopefully is that as well.
The Afco dual pass radiator and twin Spal fans certainly do the trick in my book.