I'm not a big fan of the 227, only a touch more then the hot cam. And since your using unported heads go with the 305 cam ( 305-12A cam, it's on a 112 LSA, the standard is 114 LSA). And if you're putting in a cam might as well give the idle a little lope.
The 305 has more duration and you'll need that to help air flow, the 227 with only 210 duration will have a bit more low end torque, but it's going to start to run out of air at 5000 RPMS and probably be out of steam by 5500. The 305 will pull nicely from about 2800 right up to 6000 RPMs.
227 = 210/224, .510 / .552 112
305 = 220/230, .544 / .544 112
just want to throw this out: If you plan to do a convertor, gears ( maybe ported heads some day?) Then you might also want to look at this cam:
Comp 224/230. Has just slightly more intake duration then the 305, but has more agressive ramp angles. With 1.6 rockets it will be 224 / 230, .533 / .544 112 LSA. Because of the ramp angles this cam is going to have more lope at idle and probably a small bit ot surge, but it will pull even harder in the upper RPMs.