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First off, Welcome!! And you have a damn nice 63 there...
Web Search lists Jenkins Performance Engines as being in Australia... Doubt thats the one your looking for... But Maybe..
If the claim is Grumpy Jenkins well he passed in 2012 so you can't ask him...
FWIW back in the 70's I was stationed down in Coronado & knew a guy with a beautiful 69 Z-28, the engine was built by a little shop in his home town Level Cross NC... They weren't known for building Chevys.... But it ran pretty good.... That little shop? Petty Enterprises... So, yeah Grumpy might have built a Mopar... Or two...