Julian,
I don't think the standard crank pulley fits in a Pantera, it's too large in diameter and would hit the chassis. I have always assumed that's why the pulley was changed in the first place.
The stock pump works fine in a road going Mustang. However in a Pantera with it's long tubes, I think the high flow water pump is a good idea, even if the pulley were the standard size.
cowboy from hell
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