those heads will be a drastic improvment over your factory heads, and with the 12cc KB pistons you will be sitting at about 9.5:1 compression which will be a major improvement over the 8:1 you have now. i would also get another set of gears, if you just plain in it being a fun car, a cruiser then a set of 3.73's would be plenty, plus you will need to get a set of headers and some free flowing exhaust. as long as you are going to do all of this i would recomend a cam similar to this one.
if you are going to stay with a hyd flat tappet cam then you need to stay away from the 1.6 rockers, stick to the stock 1.5 rockers. the 270H cam looks like it would require about a 2200 stall converter. if you are willing to replace the stall then i would suggest something even stronger as i think a 2200 stall is a waste of time.
what all are you looking to get out of all this, what will be the intent for the vehicle.