Thanks Diana,
I actually picked up one today from someone I know who works alot on British cars. It has an auto choke on it though. Interestingly however, he said that the SU I have is a much better Carby and if anything I should just get an adaptor plate made up. I would like to try and keep it as original as possible though, but it may not be possible by the looks of it.
I did PM a member whom I've had a very small amount of contact up here in Qld, but as yet, i haven't heard anything.
So it's off to another mate who builds racecar engines, and he reckons it's not a problem to make one, it'll just cost me a carton of xxxx gold!!
Thanks again Diana,
Shane