Well it turns out it is a 1 of 1 car, only one built!..351 4 speed LSD single tramp rod car, company special ordered who wants it!.. full resto needed but very very small amount of rust repair to do!. 14/05/2020 UPDATE! car was sold to a guy in Newcastle that is restoring it now, when he stripped the engine he found its stock bore with all original gaskets and seals so likely it had never been pulled apart before. He also found stamped on the block M WEBB and a date 2 months before it was built...
I't'll make a nice addition to his car collection.