.390 or .415 Webcam or Megacycle. Hotcam if you don't want to to TOO much head work yet still get some cam performance.
Wiseco or JE for the piston. 10.5:1 seems like a happy compression ratio. Still able to run pump gas on that. .20, .40, .80 bores are your choices. Bigger is better(?)
Get a P&P and +1 your intake if you can afford to do so. If you goin all out on the cam, you have to upgrade your springs to HD ones.
Of course a new cam chain and gaskets are a must too. DID or oem chain and cometic or versha gaskets and your good to go!
Next time, do a search for engine builds, all this info has been talked about on here many many MANY times before.