1998twin

Hi, im needing a crank for my bansee so im wanting to get a 4 mill stroker. What i currently have is vfocre, 17cc domes, dune port and fmf pipes. My ? is can i run a 4 mill with stock carbs? I currently have 59hp. I would like to gain some more power but not a lot. How much power would i potentially gain? Thanks for any help.