Thanks to Ralph, Bill, Dave, and Terry for the help getting to this point.

I went to the hardware store(s) and found the 8mmX1mm bolt I needed to attach the prop. I had requested an engine with good compression when I ordered this Poulan 295. I got what I asked for! To start it without the engine trying to bite me I had to reduce the timing to just a little before TDC . I put on a Zinger Pro 18-8 and got 7500 rpms. This is low, but the engine was cutting out past this point; probably because the timing was retarded so much. I need a 20-8 prop. Once I get used to this particular engine's starting characteristics, I think I will be able to move the timing back towards 28 degrees BTDC as Ralph has suggested. It's on a mobile test stand right now and I am trying to pay it the respect a big engine deserves. I am using the Poulan chainsaw muffler at this stage. The engine is markedly quieter than when I ran it as a chainsaw. I guess all that machinery whirling around makes a lot of racket. I will update the thread as events occur. Now I need a plane for this thing! Funny, my wife told me I'd say that.