Farmall 450 Electrical

I have a 1957 Farmall 450 LP that has been in my family since it was new. However, it hasn't run in a lot of years and a lot of stuff has been lost off of it. Does this tractor use a negative ground or a positive ground? Thanks.
 
It came 12 volt positive ground. If it has a alternator put on sometime it would probably be the other way, or someone could have just changed it to the other way. If the plus terminal of the coil has a wire to the distributor it was probably still positive ground.
 

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