Can anyone tell me where to get an engine drilled and tapped for a B & b smoke system pump? I could do it myself but I don't know where to drill the crankcase.

The best place to drill and tap is the bottom of the reed valve spacer, next to the crankcase. The spacer is soft Delrin or Nylon, and easy to thread and tap. Tapping the crankcase itself is not advisable since the metal is machined pretty thin and you may induce a flaw that will weaken or crack over time due to stress.