At this point I've almost completely lost track of what carbs you have and what metering blocks you've bought (seperate from carbs).
But I'm kindof with YR on this. Not sure what's special about 3310 blocks over a 4779, 4780, or 4710 or such.
If you want to experiement with a vacuum secondary carb, thats a different story. In that case try one of the 3310s.
Not sure what your plans are with the Might Demon, but it seems like that or one of the other shiny new items are candidates to be made more adjustable.
You'll need a tapp set with a bottoming tap. Maybe a couple different sizes depending on what you need to thread.
Someone from BLP said they have blocks with everything threaded including bottom IFR position so you have a choice. So if you don't want to tap, there's a probably as versitle of a block as can be bought.
