Ken, heat is going to be your friend in doing this , there is no need for a puller for the rear bearing.
How far along are you in tearing the engine down? Do you have the front prop hub off yet? What about the sleeve and piston and rod out?
Generally once you get those out of your way along with the crankshaft, you can heat your engine in a 350° oven for about 15 minutes and with the back plate off, then get you a good glove to wear so you wont burn your hand, then with the engine block, slam it down on a piece of 2x4 or other piece of wood with the rear side of engine to the wood, and your bearing should come out with a couple of good wacks from you. If the bearing is really stuck good, it may take a couple of heat and wack cycles to get it out. If an oven isnt available, I have also used a heat gun to heat the engine block. Just dont heat the block in one place, keep the heat gun moving around on the outer part of the engine block. Go ahead and remove your carb too if you put the block in the over, you dont want to damage it with the heat
Let us hear from you on how it goes.
John