61suburban,
From the stuff you have listed cooling wise, it seems you should have no problems. I ran a 350/350 combo in my '51 with the stock radiator, turbocharger and five blade Flex-fan (no shroud) with 180° thermostat and never had a problem.
Was the pusher fan added to help solve a problem? Have you tried driving with the whole assembly out of the way.
If the radiator is properly sized for that engine, the system is clean, not blocked or plugged, and the engine doesn't have a mechanical problem that generates mass amounts of excess heat, you should have no overheating problems.
Have you verified your gauge temp with a actual probe in the radiator fill...is the gauge correct.
With a good fan positioned close to the radiator and a shroud, you shouldn't need the electric setup. My thought would be that maybe this is blocking the normal flow of air.
Are you running a 180° thermostat? Does the radiator share the cooling load for the transmission?
My guess is you have addressed all these points and still no soap. This engine/transmission combination works well in these old AD's and there are millions of them around, all working and cooling well.
Keep looking, it's probably something obvious.
Stuart
