Need help with OLD Sears Craftsman Shredder / Bagger using 6 HP Tecumseh engine.

Hi All. New to forum but glad to be here! Anyway, for reason's to long to get into, I have to get an OLD  Wood Shredder / bagger (model # 2 ? 2 - 27006) that has apparently has a Tecumseh 6 HP L-Head engine. From help I received from others, and research on the internet, I am thinking the Tecumseh engine is model # V60-70257H??? If I am wrong I will defer to those here who know much more about these things. Anyway, I believe the carburetor is an old diaphragm type instead of a more recent bowl/float type. Again, please feel to correct or advise if I am off track. I didn't get any history at all on the shredder but since the fuel tank looks dry, I am assuming it hasn't run in a while. Therefore, I want to clean out the tank and carburetor of all the old gas and gunk (perhaps replace the condenser, old hoses, ect), as well as replace the oil and the . Or can i just get by cleaning out the fuel tank and try starting it with some new gas?  I can't find any manual for this unit so if anyone has one, or knows of one, that would be great! I could really use some help with getting this thing running. I can pull the starter rope and the shredder blade turns so I know the engine isn't seized. So I am hoping someone can offer some suggestions and sources to help me get this old motor working. I guess first off, am I correct that this is a Tecumseh 6 HP engine model # V60-70257H? If so, is there a rebuild kit for this carburetor? Or even better, is it possible to swap it out with a newer bowl/float type?If it is possible to swap it out, what are my choice(s)? Does anyone know the Oil type and amount this motor takes and how much? The  in it has no markings I can see. Does anyone know which one to get? Any suggestions on how to clean out the gas tank? Let me say in advance: Thanks for all assistance and advice!