Do the transmission pucks + flip second whatever you do
The 70cc treat kit / 14 bing will be good. Ditch the boss pipe for a low RPM pipe like a circuit or estoril. Gear tall to keep rpms down to protect your stock crank. Oh my two ZAs I’m at 19/38 (city bike) on one and 19/35 (cruiser bike) on the other.
Enjoy low to mid 40s without having to even think about messing shims and save $250 on bearings, seals, crank, and another $250+ for the factory shim tools. (edited)