Another plus of staying with a larger displacement small block olds is that ALL of your current parts will swap over. That means no having to hunt down sbc accessory brackets, pulleys, transmission, starter, motor mounts ect. That will save considerable time and money in the long run. Plus a 350 olds is a better engine overall according to many people, myself included.
The CCC system can run on the larger Olds motors, plenty of Olds guys have done it. The link which 85422/86buick posted missed one upgrade, installing a 3 wire heated O2 sensor.