I know that bike, it came from here to a client who then sold it on to P.F. Without being rude to the current seller, his price is "optimistic". I sill have the '82 WR430 project bike here. It's low on compression but has good spark. Wouldn't take much to get running if you're not too fussed about making it pretty. I also have a 1980 WR390, (or most of). It's missing cylinder, head & crankshaft but otherwise complete. Cranks are easy but '80 cylinders & heads not so much as they are a different stud pattern to the '77-'79, I have plenty of those but they don't fit! The 420 cylinders fit & make for a bit more torque. The 390 engine is the pick of the husky engines for me. So I have some projects if you want to go that way Brendan.
K