Myron's has a FEW 12mm Bing carbs (can't get anything else to drop in on that intake pipe). Hopefully you've got the white square front part of the airbox so you can at least have choke. You'll be running a 58 jet with a piece of No Nonsense or whatever they call pantyhose these days
You will have mucho fun getting all the crap out of that gas tank; below the petcock lies another cup or so worth of fluid that never reaches the fuel line
motor chain you can get at bicycle shop (as "heavy duty freestyle" chain, get 110 links and shorten PRN) along with the pedal chain
A Puch Magnum gas valve fits on the tank, points may need cleaning, condensers hardly ever crap out, goes for ignition coil tambien. Sealed beam headlight is prone to burning out, contact Myron's for upgrade
Any old regular ATF in the tranny, just fill it from the SIDE hole.
Only way in hell it'll go over 27 is with a TOMOS Biturbo that has the flange sliced off, you can expect about 33-35, extremely hard to port, you are welcome to try the Athena kit offered by Treats or MWH and tell us about it
BTW the top round chrome RUN/OFF cap will ground out across the 2 posts inside if you hammer down that screw, you will have to spend many hours re-bending the clamp and cap, or throw it away to get the spark back while touching the post to the handlebar to shut off the motor
HTH, wrote a book here