Luckily I've sourced a stamped pulley (Top pulley). If I can get the current owner of the engine to measure the pulley and check the keyway I can confirm 100% it is a 3844100 (spoiler alert I won't). Bruce (the original owner) did race the car and its not impossible the alt/pulley were changed. I'll be running my stamped pulley on my car for now. It feels like the more I learn the less I know.
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