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I'm working on tuning my 318 with a whiplash cam. It has .519 lift and about 230 duration. I have the timing initially at 12deg. It runs and idles fine but as soon as I bring it up to 3000 rpm it stumbles all over. This is with the vacuum advance connected. Without it it's fine. It's a summit dist, stock replacement with a summit ignition box. I've tried moving it around but with the vacuum hooked up it always starts missing at higher rpms. Runs good disconnected though. But I know not running it will sacrifice mileage and performance. Any thoughts suggestions?

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I can tell you on my other Diplomat with a MP 360 Magnum Crate Engine, it would never run well with vacuum advance connected. I wanted that thing connected figuring more power and better mileage. Nope. With it connected it would surge at cruising speeds. Not real bad, but definitely noticable. I finally gave up and plugged it back up like mechanic had told me to do. Runs great, and no noticable difference in mileage.