Anyone here play with spark gap while dyno testing? I'm in the market for a new distributer for my mild carbed Vortec SBC. I see some claims from companies such as DUI and ChevPro Marine that their HEI set-ups with 50,000 volts will increase horsepower on the order of 15+ because it allows for a spark gap of 0.055-0.060". It makes sense that the longer spark would ensure ignition, but is there a power gain? My 350 tops out at 4,500 rpms with an "A" stainless impeller. My current distributer is 11 years old and has end play, some wobble in it and it leaks oil up the shaft. It is a small HEI with advance built into the spark module. I'd like to get a new version of it but MSD's one only works with a computer and Accel doesn't make one any more from what I see on their website. The Mallory one looks like it belongs on my grandmother's car and requires a Mallory only cap. I like DUI full sized HEI distributer, but it doesn't have the electronic advance. It has to be reliable for long trips upriver, but I'll take a couple more horsepower and better mileage if they are to be had. Any suggestions?