To be frank you won’t be getting much mondo improvement out of such a beast. Best get to run as well as std & be happy until it is time for another bike. You will have to sort your original problem out regardless. Don't throw that airbox, trust me.
It is not a new bike so there are a few options: Your floats could be leaking. The float jets could be leaking. The float height could be way out.
The fuel line could be kinked which is hard to see & catches a few out esp if you have a fuel filter.
The airfilter has to be clean (if foam oiled only with proper oil, if paper can vacuum a bit -replace if real dirty), the tank vent open, fuel tap filter clean.
The diaphragms could be perished & finally the needle valve can wear oval, but that’s another story & would make bike rich.
& when that is all cool the front forks are often incredibly soft. I’ve heard of two that didn’t have the right amount of oil from new.
Don't you look at my accountant.
He's the only one I've got.
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