Just found a link on a distributor mfg site about excessive gear wear on Fords and the reasons it happens. Here it is:
http://www.performancedistributors.com/technical.htm
Might be helpful.
I have one of those distributors for sale, if anyone is interested. Very easy install as it doesn't need a coil (it's in the cap) and will interface with an MSD 6AL box for the rev limiter.
Paul