Carbs are rarely a performance upgrade.
Mostly just lead to jetting threads.
Start stock and then slowly make improvements.
Head is the bottleneck so putting a garden hose with fuel in front of it will gain you nothing.
Same goes with pods, mostly there for looks and a decrease in power.
Do you know the rest of the motor is sound?
You racing?
If not you will just spend money to still be slower then most things on the road in a straight line.
How about make some real improvements in the way the bike works?
-alloy wheels
-larger brakes or dual fronts
-ported head.
-have a proper exhaust made, not some slip on or Mac junk
- good tires
-larger forks
-better rear suspension
-swing arm bushings