Anyone got a better idea?? Here's my scenerio. I just installed a Weiland dual Quad tunnel ram, on my 57 Chevy wagon.. For the Dist. I used a Vertex Magneto.
Before this swap I had an edlebrock performer intake and singe 4bbl carb on there with a HEI dizzy.... never seemed to notice a the problem before.

When I rev the motor up I can actuall see sparks traveling through the insulation on the wires going to the firewall..... For the time being I placed some tar paper along the firewall to see if that helps,, but I do notice that while drivng down the road the car sounds "muffled" then without increasing the throttle or slowing down at all it "perks" up and acutally sounds like it is now running on all cylinders... Kind of hard to explain other than that, but I am guessing that it is shorting out some of the wires before the spark get's to the plugs.... I checked all the wires for cracks or breaks and they seem fine,,, although Really close to the firewall...