HARRY - Welcome back! 483/483B is still the correct yellow. The different shades of white verses serial number list is still in the FAQ's. I needed both 901 & 902 white for my 70 & 72 so split the difference with a custom mix off-topic white. 935 should be the correct white for any late model('71 vintage) 73/106/7/126/7/147 and all WF's.
Years ago I repainted my old 129 with an old fashioned suction spray gun & tiny compressor and got not good results. Paint from my IH dealer was too thick or too thin depending on how I mixed it. I have better luck using automotive paints and sticking to a single system, either ALL PPG or DuPont, or NASON, etc. And the price is about the same. Last painting we did a month or two ago we got a new HVLP spray gun and it worked great. The real work and how good the finished product looks all comes from the prep work. The new gravity feed guns all clean up with a coffee cup full of thinner or solvent. MUCH easier to use than the old syphon feed guns for sure.
The auto paints are more consistent, you add so much color, so much reducer, so much hardener and shoot it. The auto body paint supply shops also have graduated mixing cups & strainer funnels to make sure you have no problems spraying too. The gloss and durability of the paint with hardener is much better than just the enamel alone. You have to have an activated charcoal respirator filter to shoot paints with hardener. It's basically the same stuff as Crazy Glue, not good to breathe the vapors.
I'd use hardenenr on anything sprayed on steel, and anything on iron just the straight enamel is fine. We used all PPG paints, their epoxy primer, filler/surfacer, & base coat/clear coat color with the hardener in the clear coat. The color may seem expensive in that system, but you can probably paint two CC chassis with one quart of color.