Any "wrong" distributor will work on any tractor from the A thru the 450, EXCEPT the W9 gas and all gas-start diesels - these spin the opposite direction. However maximum power and fuel economy will suffer slightly unless the correct distributor is installed.
AFIK the various distributor timing curves are achieved by swapping springs in the centrifugal advance. So theoretically you should be able to get the correct curve for your A by installing the correct springs. However finding the right springs today may be a problem(!)
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Today's Featured Article - Pitfalls of Tractor Engine Rebuilds - by Chris Pratt. The first pop after you have put the machine together with your own hands is exciting and pleasing. The whole experience can be marred if one moves too fast and makes too many assumptions that they can just use "as is" some parts they should be closely scrutinizing and possibly attended to. In such cases, rework makes what could have been a fun project turn into an irritant or even a nightmare. Minor Irritants To give you an example of an minor but irritating proble
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