“ We then want to pull the radiator out, back flush it and refit with a new water pump.”
Suggest you aggressively back flush the block too. You can remove the drain spigot just to the rear of the oil filter. Garden hose with nozzle through the thermostat opening and the spigot. You’ll be surprised with what comes out. See picture below.
As to the water pump, there’s 2 kinds, look for the one with a cast impeller (OEM), reportedly provides better circulation than the aftermarket one with the stamped sheet metal impeller. Certainly the case with my experience. Also pay attention to the 2 o-ring seals that connect the top of the water pump to the the underside of the head. There’s 2 sizes.
Following with interest, you’ve got quite a “barn find” there. And good progress to date!
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