Distributors swap between all the 4G6X single cam engines. In fact, I've even used a points distributor from a 4G32 to run a G62B 12v Cyclone.

*addendum - the 4G64 is an injected engine and doesn't have the provision for the mechanical fuel pump in the head, so it would require an electric pump to supply the carb. An extra 400cc's would get it moving out of it's own way if this was the last resort for a new engine...