Hi Fred,
I have been "experimenting" a little with the cooling on my 1293, 1977 moke. My engine is fairly newly built and the block and head were hot tanked, so all clean inside.
I went with the supposed hi flow water pump, bypass deleted option, i removed the engine fan and fitted a thermo fan behind the radiator set to come on at 90 degrees. My radiator is a new 4 core type mounted to the body, if i had my time over again i would probably go with one of the more modern alloy 2 core versions from what i have heard from other people they are really good.
I switched from a small water pump pulley to the larger version and that made a noticeable difference.
I have tried all sorts of under car blanking plates to help push air into the engine bay and out through the radiator, i even have a plate to stop the air moving past the firewall side of the rad to redirect it into the rad. Under the left wing i fitted louvres to stop side wind from pushing air back into the radiator, it all worked kind of. I am on the Sunshine Coast QLD so it gets hot here, the above mods worked ok for driving around the city areas but i was a little concerned about taking it on longer highway trips. So, i got hold of a Ford Cougar double pass heater matrix and fitted it to the lower front RHS behind the grill. I have it plumbed into the heater tap take off on the back of the head and returning to a Mini Metro thermostat sandwich plate mounted under the thermostat housing.
I recently drove the car down to Melbourne and back 3675 klm's. On the way down we drove through storms where i had to follow trucks to get the temp up over 50 degrees, in the end i found an old 2 litre ice cream container lid to put in front of the heater matrix that got the temps up to 80 degrees.
On the way back i drove through the bush fires so it was hot and 110 klm roads, the engine runs cooler the faster i go, depending on the ambient temps the engine was running between 72 ish degrees and 80 degrees. Sitting in traffic in the towns i went through the thermo fan would start, once moving again the temps would drop right back.
Still a work in progress.
Cheers
Dave