I got charts and stuff that'll tell me where to jet it. Thats How I did my 450 so perfectly, start where the charts say and fine tune from there.
Actually I would leave the wheels and hubs alone. Just polish them out. Now if you wanted to add color to the wheels you could always get the spoke socks and do them in yellow. But thats my only input. Otherwise its your bike you do what you please.
Well if you could leave the hubs black that would be cool to. Exactly what are you looking for? Restoration, reliable trail bike, or something a little custom? Or maybe some of each. I look at it this way if you would really need to stip all the black paint off those hubs for the yellow paint to be worth while. Plus you'll likely want to prime them to make that yellow paint stick good. Thats why I suggested the polished look. Or scuff up the existing black and do a spray over. Its your project. But I know your asking for input. So Im giving it to you.
You will have to recalculate the jetting with some guess work. Your chart will be off if you over bore it. Remember the bigger cylinder will require more fuel to get the correct combustion.