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I'm no expert on Allis motors, but I do know something about engines in general. Blue smoke on startup usually indicates leaking valve seals. There are many reasons why engines can foul plugs besides oil usage and someone may have put them on in vain to try to stop it. Since there are 6 of them its a good indication that whoever put them on didn't know what they were doing. Seeing that they sold the tractor probably means they didn't fix it. One thing you probably be sure of is that you are going to have fouling problems probably with the anti-foulers and certainly without. If it is oil fouling, you will certainly notice the oil disappearing from the crankcase and coming out the stack as engines usually have to use alot of oil to oil foul plugs. One common problem that causes plug fouling is improper ignition timing. Alot of folks(including one supposed expert tractor mechanic I know) set the timing idling to the full advance spec instead of at the full advance rpm. This guy I know rebuilt my neighbor and his' 35 Ferguson to stop plug fouling. This $650 bill and a couple of $100 bills later, he still had plug fouling. I set the timing and the valves on this tractor and hasn't fouled a plug since. Any weakness in the ignition system can lead to plug fouling. Another thing to look out for is improper valve lash. I'd give the igniton system a good going over, checking the points, condensor, cap, rotor, wires, distributor shaft bushings etc. Also check to make sure the centifugal advance in the distributor is working properly and check the timing, making sure to set it to the right spec for the rpm. Then I'd set the valve lash and get 6 new Autolites(my preference -- and they come in a nice orange box). There is a good possibility that if all this stuff is right, you won't need the anti-foulers. If you still have problems then you may have to consider getting into the innards of the motor. Maybe just valve seals or maybe worse. Good luck.
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