HEI and OEM ignition interchange-plug gap scenario

Thanks guys! I've already noticed a significant improvement. I can also tell my original wiring had issues from watching my aftermarket volt meter I installed. Must've been pulling down the voltage pretty bad because I'd have 14v+ at 1000 rpm but only 12v at idle and less with the lights and heater on. Now I've got 14v+ at idle and still have 13v+ with lights and heater. I'm sure I'll be very happy with her once I get the new cap/rotor/wires on and regap the plugs.