I installed a Crane/Allison XR700 in my Bosch distributor 4 years ago and have not had to open/maintain it since nor adjust ignition timing. Indirectly, I'm also saving wear and tear for the next generation of preservationists as the cam lobes are now untouched by points. :-) Am now planning to install a HI-6S box to augment the breakerless setup.
Sherwood Lee
http://members.rennlist.org/911pcars