Well, I got the donner engine running today. Had to rebuild the Carter BB-1 updraft carb (filthy - rust, scale, corrosion and silt. Lots of silt). Never been inside one of those, pretty interesting. I reused all the original parts, including the gaskets. After cleaning with just WD-40 and rags and small wire for the tight spots. Then hit them with carb cleaner. Next I boiled the carb in lemon/water solution for 30 minutes (25% lemon juice - 75% water) on my wood burning stove I have set up outside. Rinsed them with water and hit them again with aerosol carb cleaner. Although the carb was in really dirty condition, inside and out - I had success.
Next up brakes and then move the cab onto this chassis.