1958 Ford 861 Tractor

Not to sound like a smartass, but if you are checking for spark at the plugs, have you checked to make sure the distributor is turning? Sometimes when fighting problems the obvious gets overlooked... I've done it before on my 1954 Cat D2 dozer!

Hope you kick it soon!

Alan

Quick search for Ford tractor forums... http://www.google.com/webhp?sourcei....,cf.osb&fp=79a914ef1cf0f6d4&biw=1536&bih=671