Mike,
Thinking about it, if you are going to the trouble to change the pistons AND converting to PMOs from the CIS, you might as well go to the trouble of changing the cams. The SC CIS cams are deliberately mild to avoid inducing back pressure waves in the CIS system that will move the airflow plate around too much. With the PMOs, you can use a bumpier cam that can generate all kinds of interesting reversion pulses up the carbs. Also, the longer overlap period of a more aggressive cam will mitigate the effect of the higher compression pistons.
The cam towers are already off for the stud replacement so it's no more work
while you are in there.
Check out
http://drcamshafts.com for the basic specifications. Something like the DC-40, an improvement on the early S profile, would be a nice compliment to your 3-liter motor. Or to really get your blood pumping, why not the 3.0 RSR cam? You already have four-bearing towers. . .