Thanks for the replies gentlemen!
We did try to find an endless timing chain, but were told they are not available.
PEH, we did have some discussion about putting the chain in before crankshaft et al, but there was a problem with that. I'm trying to remember what it was, but I think that there was no room to crimp the chain (since it's not endless).
Yes Stevo, please do clarify 23 degrees BTDC. Hey, since you've done this before would you mind coming up and supervising the whole process? :p When you did yours, did you use an endless timing chain?