Bevan,
I think those days are gone a bit, as the roads here arent that brilliant, and with the car will still do about 170mph at 7000.
I still havent ruled out an alloy BBC, we havent been able to get good build sheets on alloy SBF yet but have been in contact with Joe Fontana, he makes a mean cleveland block with good
oil system, and there are plenty of high flowing alloy heads that are equivalent to the cleveland available. Decisions decisions.