You guys need to read the New Car Features book before you decide what you can or can't do to this engine. 13 psi is crackhead boost. Literally. My Supra detonates at 14 psi on Cali 91 with 8.5:1. Consider yourself lucky if you can run 6 psi at 9.6:1 on 91 octane without severe ignition retard from knock even with a big intercooler.
Sleeve the block? I think you missed the part about the sleeves being cast into the block, and made so thin that there are NO oversize pistons. If the bore is damaged, it's new block time.
Add to this, does anyone know what the injectors flow? How about the flow measurement limits on the MAF? Those two items will limit power faster than anything else you can imagine. Luckily Toyco over-engineers their stuff (I know the MkIV Supra is good to 500 hp for MAF and fuel), but when does it all end and you have to upgrade sensors?
Speaking of upgrades, is the engine boost aware, and if so, how much? The MAP sensor in the 2JZ goes up to 13.75 psi (2.0 kgf/cm^2 absolute) before the output voltage peaks. Anybody know what sensor is in the 2AZ?
There's a lot you can do without FI, but it is expensive. N2O is cheapest as long as you do it right. Hard to say if you need a wet or dry system though. Still too many unknowns with this engine...