Assuming stock bottom end, you may be as low as 8:1 comp right now....with 76cc heads. Small Carb, no comp, bigish cam, all of this spells dissapointment. If your leaving the bottom end as is, then get heads with a 58cc chamber, run a 0.015 head gasket, get yourself a 750 Carb, and watch as all of it comes together and makes far more power then you currently have. Call this guy. Speier Racing Heads
and tell him what you have, and want to accomplish. His prices are excellent, he is available all hours of the day...and will tailor the heads to your combo.....ie: 58 CC chambers for 10:1 compression.
And there you are.