Thanks Gary, Excellent information. I have the manual on order from Faxon, but it seems to take a while to get to Australia.
The engine is stripped and it only seems like the No.7 Big end has an issue. (not 4 as I said earlier)
I will pass the information onto my engine builder.
The engine received a $30,000 rebuild 4 years ago, 3 years before I bought the car.
It was owned by a promotions company and I don't think they got a good deal from that rebuilder.