Some good advice above, especially about keeping things clean and about using a standard viscous coupling for ease and simplicity and the importance of the correct thermostat is paramount. Please don't fall into the trap about cutting the guts out of a thermostat and running that as you will end up with localised hot and cold spots as the water velocity will be too quick through the block as the engine warms. This will cause premature engine wear. I am well aware how far this OWT dates back as I was done often in the Holden dealership I was working at back in the mid eighties and we all thought it was the right thing to do back then (everyone thought "cooler was better") but if the engine doesn't actually ever get to operating temp - except when idling in stationary traffic, then the engine will suffer more blow by, choke never fully opens etc etc.

If you decide to go down the Falcon thermo set up be aware that while it can be made to work well, the physical positioning of the fans in their shroud does mean that (the top hose on a Aussie V8 especially - wont have the same hose positioning issue with a Chev V8 or a Holden six) the relief you'll need to cut in for the hoses will be quite large. I've gone this way with mine and while there is quite a bit of gentle cutting and modding to fit, the fans work quite well and in all (ie; I had an alternator built to my specs and punches out over 120amps on the test bench), coupled with a recoed three core copper/brass radiator is having no problem keeping my healthy stroker cool. I'm running an 82 deg C thermostat and have set the fans to cut in one by one at 95 and 97 deg C respectively. Davies Craig do a couple of really good thermo control boxes and it also allows me to cycle one fan with the aircon compressor as well. You'll need to be able to read a basic wiring diagram and wire up three relays (not hard).

If you haven't already bought a set of fans have a quick look at VY-Z Commodore fans. They are positioned a little better but I am not exactly sure about shroud sizing/mods needed to make them work.

Hope that helps.

Dave