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Presumably no-one has thought about making an upgraded pump for the slant 4, or could you use one from a Saab on a Dolly?
Fuuny about Saab. They always advertised their cars with a slogan we built aircraft blah blah, yet very few of their front-line jet fighter use Saab engines -- mostly made by Volvo. And for a period they used and improved a Triumph power plant on their cars.
Saab changed the water pump design for the 99 (when the turbo model made came in), however this won't fit a Dolomite,
but the Saab water pump immediately preceding it will fit (if you use a Triumph 12 vane cover).
There is someone who sells an external belt driven water pump conversion for the Stag (uses a Ford Essex water pump)
but, looking at photos of this pump installed on a Stag, I don't think it will work on a Sprint because of the engine mounting location.
The other external option is an electric pump.
Stewart Pumps in the USA make a suitable unit (200 litres/minute flow rate).
Talking of jackshafts,
German Ford V4 engines have a counterbalance shaft. Saab used these in their 96
Ian