I think a Holley 390 CFM 4 barrel might work, but I think your time would be better spent working on your imaginary project, rather than asking elementary questions on a go kart forum about a motorcycle engine that already had 4 perfect carbs on it.
The simple fact that you did not understand why I asked you to describe the engine proves that you are decades away from actually touching such a project.
Have a nice day.
well if the bike actually had four carbs on it woudnt be asking this wouldnt i?

and the reson im asking is because the engine is going ina go kart, i know that it is still a motorcycle engine but i kw ppl have put bike engines in karts so it still seemed reasonable to ask.
And YES i did ask google and chagpt and many other people, and i aslo Do need a lot to learn, thats why i ASKED and didnt just slap some carbs on, I guarantee yall im one of the youngest people on this forum if not the youngest, I def kw how to use the internet better than yall so if im here asking for answers it prob eans there isnt one elsewhere,
as for your holey carb, how on earth would a verticla draft carb fit on an INLINE four?? sure i guess it could with custom fab but since you already guessed its a motorcycle engine why dont you help me find one thats for a bike, not a car, or a V
as fpor your comment saying i dont understand anything about engines, Ill admit im not even close to knowing as much as yall (another reason why im ASKING here and not chatgpt who just gives you one that FITS, not one that WORKS) but if i said i need it to reach 11000rpm while providing enough fuel for 30hp per cilinder then it prob means that my engine CAN reach those speeds no?