Sv, raise the window and put the carb end of the vacum advance hose in your mouth. You might need to use a longer hose, suck on the hose and put your tounge over the end. Does it hold vacum? If not the vacum advance diaphragm is punctured,cracked, busted, bad. If it holds vacum you will see the breaker plate move clockwise when you remove your tongue. Make sure you are getting vacum from the carb. That truck probably uses ported vacum for the advance.(only has vacum when throttle is partly open). Many fords used manifold vacum for the advance(vacum at idle and open throttle). Either way is ok. The vacum advance will only help mileage. Will not give more power. Sounds like centrifugal advance is working. The vacum advance is easy to replace, two screws into breaker plate. Ps don't go to hot on the plugs,some times causes a no load miss.
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Today's Featured Article - It Can't Be Done! - A Tractor Story - by Neil Campbell. I'll never forget the time back when I was a boy baling hay on our Farm in Big Rapid, Michigan. The most memorable event that took place was a trip up the steepest incline on the farm pulling an old New-Idea baler with a pony-motor for power and a haywagon. I had just talked my Dad into buying an old John Deere B with 6-speeds ahead and I was real proud of it, except it was a little smaller than the Case tractor that we normally
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