I do not know anything about it but it looks to be a GM HEI module mounted on the exterior of the distributor. I have not seen one of these before and I imagine these are great for tight clearance applications that want the reliability and availability of a GM style HEI module. Other than being a little dusty, this distributor looks great. It spins smoothly with no excessive slop or binding. Don't miss this awesome distributor.This is your chance to own a awesome Small Body HEI distributor you have been dreaming about at a GREAT PRICE! Check out my other listings for more rare and hard to find parts. The item "Small Body HEI Distributor Small & Big Block Chevy Engines Uses GM Module SWEET" is in sale since Tuesday, November 2, 2021. This item is in the category "eBay Motors\Parts & Accessories\Car & Truck Parts & Accessories\Ignition Systems & Components\Additional Distributor Parts". The seller is "super-novass" and is located in Santa Cruz, California. This item can be shipped worldwide.