The FE distributor is #8594. Check out the MSD website at
http://www.msdignition.com/ Make sure you get the appropriate drive gear to match your camshaft (bronze or steel).
I had a Mallory UniLite unit on the car when I purchased it from the original owner. I averaged about four months between optical module failures. At $95 a pop, it got rather obnoxious (not to mention irritating to be standing at the side of the road during rush hour traffic) so I replaced it with the MSD.
My experience with the MSD distributor has been good. I experienced a problem with the distributor about a year after I installed it. I contacted MSD, who told me to return the unit. They replaced the internal works and returned it to me at no charge. Quality company.