I'm not sure, but I do know that the timing cover is different, so that may make a difference. If you're cheap like me, I just used a length of clotheshangar wire and its worked well so far!
This is, if they are interchangeable. I can not see why they are not. I know the water pumps are different if I recall, but I don't see that interfering with anything.
When I was in school, we used a sundial and abacus if anyone needs help using 'em.
Seriously, I dont know about the timing pointer. You could do your own as was suggested but getting it right-on could be tough (unless you have one to model from). They have to be available new out there (if not one of the blingy ones). A J/Y or classifieds is a good bet.