this is a VERY expensive setup.. just the darton sleeves are over 1500... and the J37 parts are ridiculously expensive. That damn J37 crank is almost double the price of the RL crank. AND P2R isn't a cheap company either.
For the EMS, you can get a 4CYL cluster and an additional O2 sensor($200) then it should work properly. NVA-AV6 gave me a run down of all parts needed to get it working. I think you should send him a quick PM if you want to keep using an accord cluster.
I think with those mods, you should easily be pushing 450 on mild boost. With darton sleeves, you can push even more PSI over all of our J36/J35 builds.
What's your plan for traction? I'm currently running 245/40/18 tires, and I'm still spinning tires. With your power, you will have to run even larger tires and stickier compound to put that power to good use.