If you are using the jeep-style distributor (with the cap/rotor upgrade)...then you need to still run the ICM. If it's an HEI style distributor, then you don't.
Yes, you can run an upgraded coil w/ the jeep-style distributor....I'm using an Accel hi-perf coil (square) mounted to the firewall. Works great & plugs are gapped to .040.
probably out breaking stuff.