What jet do you think?

yes i would go up to a 250 main (around about) you will need to look at your plug or do a plug chop. and get yourself some extras that are larger so you can rejet after you get another pipe.. you want another pipe.
 
yes and it will be a much quicker bike. should be around a 290 with a fmf. depending on a lot of things of course.. altitude, air temp. do you still have the oil injection pump hooked up?