If you are running a higher output coil then the gap would be larger. For example the plug gap for my stock 396/350 hp stock coil and dist. is 0.35 but for the later model HEI' with higher output they were 0.45 gap. The higher energy you have going to the plug to arc across the larger gap then the more spark you will have exposed to the compressed A/F mix. I am not familiar with that particular brand and what the plug gaps should be set at exact though.