The screws are hex head screws and they sell a short nut driver especially for this job. They are 7/32" hex retainer bolts as they are called on the AmPro Ford ignition Module Tool, I bought, and the AmPro part number is T71266. A 7/32" socket will work if you can get at it with a 1/4" drive ratchet.

I changesd several of these. On the last one, I added a piece of Aluminum flashing between the Ignition Module and the distributor to act like a heatsink. I let the "heatsink" extend out iinto the open at the bottom of the Ign Module. I coated both sides of the "heatsink" with "Artic Silver" computer processor heatsink paste. I got tired of messing with this "better idea of Ford" and putting up with the missing caused by heat. This was a big customer complaint and no doubt why Ford quit putting the ign module on the dist.