You don't state whether you plan to use rattle cans or a paint gun.
A paint gun will do a better, longer lasting job on whatever you paint with it. If you use a spray gun spend the extra $20? and use a hardener. It makes the paint much shinier and is tougher. Use the same paint on the engine as the rear end.
I don't make jewlery so I just buy whatever brand is cheap - but always with a hardener.
I'm currently using some Tisco paint. I bought about 40 quarts of it a few years ago. I suppose a real body man would crap his pants if he heard this but I use any old brand of hardener with it. Most brands of tractor/implement enamel are pretty similar in formula so I don't worry about the small stuff ie same brand hardener, reducer, etc.
Don't forget that you can use a brush on your tractor too. Buy a good "china bristle" brush and have at it. Brush painting your tractor is Ford Approved :)
This Blue thing is off a later model Ford. It was brush painted. Brushing usually requires 2 coats btw.
Here's some rims and centers I brush painted too.