IMO the key to power is a solid short block. With the stock rotating assembly, and dished pistons, you will need heads with a small chamber. This will bump compression. Otherwise, performance heads and big cam will not make power, but they will cost you power. I went 10:1, with a hydraulic flat tappet, receonditioned the rods and crank, and a set of worked 781s and just cracked the 500 mark. So you can see where the need for a solid rotating assy is a must. If you do not have the money now, build what you can, and enjoy it for a while. Save money, then when you have more money put it into the engine. Best of luck.
Tiny