Chuck that engine looks stellar, wow. As far as cleaning I like to paint on Berryman's chemdip carburetor dip, it makes a lot of fumes and evaporates a lot you have to recoat it a few times then hose it off. Lacquer thinner can help a lot, it is VERY flammable, and lots of fumes. The purple cleaner is good, heat, pressure, and steam really help.