Mopar 'HEI' Drop in distributors.

The Bosch BIM024 module appears to also be a variable dwell ignition module that is similar to the 4-pin HEI module. If you already have an electronic ignition distributor, it is straight forward to replace the Mopar ignition module with a 4-pin HEI or BIM024. I think GM parts are much easier to find in junkyards, which is where I got everything for my own HEI upgrade.