Well... Carbs are a finicky business because fuel delivery is finicky. I'm guessing it ran lean on the old motor?
Anyway, as far as performance, that's hard to say. Modern fuel delivery systems take in massive amounts of information and decide on how much fuel to give from that. Mass air flow, ambient temperature, air box temperature, ambient air pressure, throttle position, oil or coolant temperature, exhaust O2. Sometimes more. Carbs were built to a specific set of all those variables.
By putting a smaller carb on a bigger motor, that all changes. But how? Well... not sure anyone knows exactly. Some could probably make educated guesses, like that kit you got, but you'd still have to hit a dyno for optimal performance. Even then, it'd only be optimal for the exact air temperature, pressure, and relative humidity.
Carbs are like using a sledgehammer to drive a nail. You can do it, but if one thing changes from your calculations it all goes to hell.
I'm sure there's dynos in Tucson. Even in places like Houston you only find one or two with a web search. But the Harley service department I went in when I got a flat had a dyno even. If they install power commanders, they either have one or can point you to someplace that does. (And with 90's materials, 2.5-3 bhp per cubic inch is a decent rule of thumb for high performance engines. So 140-160)
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I'd rather ride home in the rain than drive home in the sun.