Depends on where Old checked the spark. If he checked it by testing the high tension lead from the coil and got a good spark it does not necessarily mean he would consistently get a good spark at all of the plugs.
I have a clip on by pass unit made from an old Toyota hybrid unit. It only uses the points in the distributor and bypasses the in house coil and condenser. I hooked it to an old misfiring Jubilee three times and each time it ran fine. When I removed it and restored the regular system it ran like crap. The mechanics said can't be the distributor. They fixed it by adjusting the carb. It ran okay a couple of days then went bad again. Problem was two new condensers. Old said the original condenser was okay. Intermittent failure of a component is a hair puller.
I did have an intermittent failure of a Lucas coil (Prince of Darkness) on an old Jag and it did run like Old's Ford. But his ford does not have a Lucas coil. Hence the joke.
Despite my stories I still think the majority of symptoms indicate the carburetor and if not then somewhere in the fuel system.
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Today's Featured Article - Earthmaster Project Progress Just a little update on my Earthmaster......it's back from the dead! I pulled the head, and soaked the stuck valves with mystery oil overnight, re-installed the head, and bingo, the compression returned. But alas, my carb foiled me again, it would fire a second then flood out. After numerous dead ends for a replacement carb, I went to work fixing mine.I soldered new floats on the float arm, they came from an old motorcycle carb, replaced the packing on the throttle shaft with o-rings, cut new ga
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