If nothing else you need to run PR3 (USDM Si) pistons in it. That will put your compression right around where it needs to be. Just get OEM Honda pistons/rings, if the cylinder walls look a little shiny get it bored a standard over bore. Get good bearings and go ahead and do the bottom end. If nothing else for insurance since I am sure you have picked up a used GSR block that you don't know how well it has been maintained. With the RPM you will need to turn with a stage 2 cam going ahead and doing a budget rebuild on the bottom will give you some good insurance against premature failure. Run a type R oil pump. Invest in a quality header. Those would be my words of wisdom.