GM HEI conversion questions

I put a GM "8-pin HEI" in my 64 Valiant. It has sealed connectors and cable to the GM E-core coil ("external coil"), so doesn't need a box. I mounted on an old CPU heat sink. Cost ~$15 at PickNPull. You find in any GM V-8 w/ TBI (80-90's trucks, inside distributor). I bought a new spare module for $20, buy you need junkyard first for the cables. I also grabbed the knock sensor and module to later use the 8-pin's spark control input (optional, Holley Commander 950 interfaces). I haven't run the engine yet since painting, brakes, suspension, ... but will probably try a 0.060" spark gap and lean the carb for better mileage.