My 48 Merc still runs rough, surges and bucks in lower gears and runs rich. Plugs carbon up. Adjusted carb many times. Lowered fuel level twice after adjusting to spec level. Rebuilt disributor. Rebuilt coil from Skip Haney. Vacuum is plugged to wiper motor. Runs at 180 degrees. Didn't check compression yet but was rebuilt at some point. Has updated oil pump. My uncle's original low mileage 40 Ford convert runs so nice and smooth . Merc used to run great when I had dual carbs on it. But took them off later after problems started. Carbs also leaked but now fixed that.
Any ideas would be appreciated.
I didn't find the right solution from the Internet.