Thanks for the answers on the filter. Back to the original post, all I can offer is the obvious, that as voltages increase the potential for leakages increase. Its kind of like water in a way. With more pressure water tends to find the path of lease resistance and escape. I'd check out all my wires again and make sure there is not a short or cross firing at the cap. You might run it at night and see if you can detect a blue arc.

Unless you are runing a full race engine I question the need for a coil on an HEI system that produces 45kV. It looks pretty, but I don't think its needed. The stock units are good up about 10k RPM. Just my opinion. Oh and thats an awesome 911.