Ive been on the hunt for awhile now too. I bought an entire running 460 just for the P&C. In the end I could not bring myself to massacre the good running 460 so I ended up buying another 460 that ran well but really needed an oiler, clutch cover, B&C, and tank. Took the P&C off that one.
I'm just sympathizing with the frustration of finding a used 46 cylinder. Just plain hard to come by. Have to buy entire to saws to get them apparently. Or go with a Meteor. I have one of those on the way too.