New 440 Build - Ignition Question

I ran my 12.5:1 440 with the MP electronic distributor, Gold Box, Accel 8.8 wires and Mallory Promaster coil, Accel U-groove plugs. The plugs looked perfect and it never missed.

Almost forgot! I switched from the Chrome box to the Gold box and it went 1/10 quicker. I heard you shouldn't run the gold box on the street. I don't know if that is true because of heat or what.