Anyone local to me capable of correcting errors on a 904 race build

No neutral drops for you then.
Sorry, humour helps in these situations.
Sound like hes having problems but should acknowledge his customer/associates for his name sake.
If you give up on him FABO should be able to walk you through the problem as you probably already know.
Good luck either way.
The factory service manuals like mymopar.com are extremely helpful.
Is the 904 stock?