If it's a genuine New York State Tractor, Keep it blue. Not many of these have survived, and less in Original paint, so that would be an eye catcher, just as a few Military tractors that have be re-done in original Military paint & Stenciling.
Don't mix Blue & Yellow, ugly as heck, look at Ford Industrial Tractors of the 1960's.
If you go yellow, it's NOT Prairie gold that vintage, it's an Industrial Yellow, MM called "Energy Yellow" same as a G1000. John Deere Ind. Yellow is very close.