so youre semi-built. stock seeves?
stock ignition is fine up to +350hp so yore cool there.
300hp is very feasible...i'm lookng for that on stock internals @ 153k miles
that should be a mid 12 with decent traction (decent meaning <2.1 60ft)
i'd recommend tuning for 10psi on the street, 15 at the track on race gas just so you donthave to pull much timing if any.
fuel ecomony wil be dependant on your style of driving. for example my turbo doesnt spool unti 3500-3800rpm. This means if i drive conservatve and shift at 3k its as if it was stock. i believe you have a t04b compressor housing, a little smaller, so it may spool a few 100 rpms faster. highway mpg will be 1-2 higher than stock sinceyour engine doesnt struggle s much to "breathe" the same amount of air...it becomes more efficient.
unless you plan to swap out you intake manifold go for the p72. a p28 wont open the short runner butterfly's.
DSM injectors are 450cc and are peak & hold type so you're better off with aftermarket saturated/high impedance. give viren a call @ 469-438-4621 (vsmotorsports.com), he can hook you up with a nice price (less than $300, new) on delphi injectors machined to fit your rail. they're rated by lb...conversion is 11*lb rating=cc rating...so 55lb would be 605cc. rc's are overpriced, rebadged/stamped msd's
fuel pump= walbro or holley, either will work
fuel rail not necessary
whoever you choose for your tuner make sure its someone you can trust. you'll be talking to him alot. prices vary, somewhere around $400-600
look if youre interested...I have also have a 96gsr converted to obd1 (94-95 p72+harness) but now i'm looking into aem's ems. They have a part # for obd2's and since i still have my stock ecu I figured I'd use that and sell my obd1 setup. give me an offer