I knew I recognized you from somewhere,
My chip would act like there are still stock injectors in place. I cannot currently tune for larger injectors, as soon as I get my XR2 back up and running its one thing I will be working on again. RCICustoms is running 450cc injectors using a FPR to lower the pressure so the flow closer to stock injectors.
The Walbro I'm running is an external pump, because of my modifications I could not keep the existing fuel tank in place. I had to replace it with a fuel cell in the trunk and it did not have an internal pump hookup. I'm told that most walbro in-tank kits will work, the assembly in there is not all that complicated. The worst thing you might need to do is cut a small piece of pipe the pump nozzle fits into so you can hook up a piece of hose, but some walbros might hook up that way so I dont know.
16psi is the limit of the stock and most hybrid turbos, volume-wise the chip can support just under 400cfm. I was maxing it out on a Tbird compressor at 17/18PSI.