If you are going all the way[:D] get the reed/carb, but you will need to open the inlet, to suit the reed block, which means you can not go back to a normal induction, as you completly remove the inlet seal (look at www.curareracing.com pictures to see how its done!)
but if not just use the 28/30mm del with normal manifold, which set up right, will work well enough, untill you want to reed!but remeber you lose the autolube, and you have to be carful about the fuel in the tank, as if it goes too low(almost run out) it will be lower than the carb float, causeing starvation,not a problem(unless always running out!), but better to know before mister sieze comes to town!
crank: full circle for reed and kit, cut crank just for kit!
Have you matched the ports to the cylinder? this helps!
Hp4 is good[:D] but timing must be checked with a strobe,and will also give your clutch/gears a hard time, as you have less wieght to slow the engine, between changing gears.and tick over will need to be higher,and your lights will not be as good, as less voltage is produced! but worth it!