Thanks very much for the replies! I'm aware of the Dennis Moore book being 'the one to have' but also hard to aquire, hence my earlier remark!
I built it from google searches and the sticky on here (which has been invaluable at other times too when trying to work out head/block combos!) last time, but I'm sure there's a few little tricks in the books that would help me build a better engine!
I'll start with PMing Kerry an offer for razzle