Two setups for your review...

Whatever setup you use, try to keep the linkage as tight and slop free as possible. Otherwise you will have problems getting a reliable idle, and also if you set it for full throttle and there is slop in the linkage, engine vacuum can pull the butterfly past full open, closing the throttle partly and losing power. (Don't ask me how I know this...)

Some carb/manifold combos can be "turned over" as you mentioned to put the needles to the rear for easy adjusting, and some can't because the carb pulse hole is then blocked. Check yours because if the pulse hole is blocked, the pump in the carb can't pump fuel. If this is the case, you can drill and tap the pump cover on the carb, and route a hose to a fitting drilled and tapped into the crankcase to make the pump work.

It looks like Ken's setup in the picture above has a "twister" manifold. They cost around $15.00 bucks.

AV8TOR