Well lets see a 330 big bore kit probably has a 80mm piston wich is 6mm over stock since the stroke hasn't changed that would be 65.5 mm if you do the formula for figuring CCs.....
BORE (in cm) X BORE (in cm) X STROKE (in cm) X .7854 = Cylinder cc's
your engine's CCs are......329.24 rounded. now if you were to stroke the engine as well then your CCs would increase to.... 351.9. that's a max on that engine this isn't including the porting on the head wich will add about 5 to 9 % more power
If were to add the same Stroker kit to my 250X My CCs would be the same as yours .....351.9 CCs you see my engine is Identicle to yours only the stroke is different and I have kickstart. but I have an 80mm piston 12:1 .50 over I'm sitting at 288CCs right now, not including the cam, jetting, exhaust, and soo to be ported head, and 38mm carb.
well see red we dont know whats been done to it all i know that done to it its in my sig so all i know it could be bigger then a 330 man and i am getting a gps sometime this year or next year red