Problem solved so far. Bought a Holley HP main body and transferred all parts from the Ultra over.
Starts right up now when hot and no fuel leaking into the intake. Had to richen the carb up quite a bit, so surely it was dumping fuel into the intake while running too.
Holley have acknowledged the problem and will repair or replace the carburator.
Will have to wait though as I need most of it for this years long trip Ddwn to Le Mans Classic.
Thanks for everybodys help to identify the problem.
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