The following pictures with instructions will demonstrate the factory-recommended method for timing side-mount distributor engines. This info is from the Ford Dealer Mechanic Training Manual:

http://projects.mergecomputer.com/ford%20tractors/Service%20Specifications/Servicing%20the%20Distributor/setting%20timing-1a.jpg

http://projects.mergecomputer.com/ford%20tractors/Service%20Specifications/Servicing%20the%20Distributor/setting%20timing-1b.jpg

http://projects.mergecomputer.com/ford%20tractors/Service%20Specifications/Servicing%20the%20Distributor/setting%20timing-2a.jpg

http://projects.mergecomputer.com/ford%20tractors/Service%20Specifications/Servicing%20the%20Distributor/setting%20timing-2b.jpg

http://projects.mergecomputer.com/ford%20tractors/Service%20Specifications/Servicing%20the%20Distributor/setting%20timing-3a.jpg

http://projects.mergecomputer.com/ford%20tractors/Service%20Specifications/Servicing%20the%20Distributor/setting%20timing-3b.jpg

Best internet source of information and help for old Ford tractors. www.ntractorclub.com