This may be way off base, but my '52 GMC 228 cubic inch six cylinder is running Chrysler six cylinder mag pickup and reluctor (circa 1977) inside the stock distributor. The ID of the reluctor has been machined to slip over the cam that operates the points (which have been removed along with the condenser).
Two signal wires ( + and - ) leave the distributor body and find their way to a GM HEI module I have hidden inside the original voltage regulator box on the firewall. The other two pins on the HEI module trigger a Blaster 2 coil, which has similar specs to a GM HEI coil.
The guy I got the parts from may be open to trying the same (totally reversible) mod on an OHC6 distributor. Here is his write-up on doing the mod to an old Chevy/GMC distributor.
http://devestechnet.com/Home/HEIgnition