Flat plane crank

Not if you're the sole or majority contributor to the project, and certainly not when proven parts are already available. I don't know how much a custom crank would cost, but that would be your biggest hurdle. A custom cam is a custom cam...figure out your firing order, make a couple phone calls, pay your money.

Power is in the heads and only limited by the method by which you extract it (compression ratio, cam timing, RPM)...IQ52 has said it in these forums before, 3 things make power, cylinder heads, cylinder heads, and cylinder heads...