Good point about the 6-versus-8 spd. We looked at a 3000 a couple of yrs ago, advertised as 8-spd but I could never find 7 & 8 (shift decal was long gone). Finally realized it was a six-spd. Told the owner the ad was wrong, he calmly said it wasn't, he'd counted the speeds...6 fwd + 2 reverse = 8 spds.
As for the dry air cleaner, our 65 gas has a dry unit like this one does. CNH parts site says early diesels did have an oil bath.
Re the thermostart...yes for diesels but this tractor is a gas, carb & distrib are in the RH pix, so no thermostart.