IDK about adding heat to the system. When I ordered it, I was curious about that as well. In corresponding with the guy, he said he has not had any reports about that with the many units that he’s sold. We shall see
Is it necessary to use that adapter for the HEI? Of course not; the HEI could be installed just about anywhere with a suitable heat sink and wiring. I liked this setup with it’s proximity to the dizzy harness and being so close to the factory coil location wiring-wise. I’m using the Blaster III coil on the stock re-finished coil bracket.