Ralph,
All those goodies in the bottom end of the motor, and you're using Keith Black hypereutectic pistons? You may want to SERIOUSLY reconsider that, they're just glorified cast pistons. Good quality forged pistons will cost very little more, and with these pistons in there I would think that your cam is the least of your problems. They're just not up to par quality and durability wise with everything else you're putting into this engine, not even close. The rest sounds good, you're choosing top quality stuff except for the pistons.
As Rick said earlier, cam wise bigger is not always better. A roller with it's quicker rams and all can get you more power across the board without some of the downsides that comes with a flat tappet setup. It's not a miracle worker, but it's a help. Most of your more modern highly developed grinds are in roller format. By the way, if you're buying a new crank anyway, which it sounds like along with new rods and new pistons, why not stroke it?
The easiest, cheapest and smoothest way to get more power and torque is a stroker kit. Unlike bigger cams and bigger heads, there is no real downside to live with from stroking an engine until you start to go to extremes with pin placement into the
oil rings, piston speed and / or rod angles. This only happens when stroking to the extreme limits. Best of luck, the car sounds really nice, ERA builds a beautiful FIA car.