1. Well if you use the GSR crank, you are taking away the advantage of the longer stroke of the LS crank that gives it more displacement than the GSR. Use the LS crank, and get it balanced.
2. If you wanna run 100+ shot of nitrous, definitely invest in a set of stainless steel valves. Nitrous creates high cylinder temperatures.
3. If you're gonna run 100+ shot of nitrous, you're gonna need to go with a direct port kit. Each intake runner is tapped and has its own nozzle to spray nitrous and fuel, so no strain is put on the injectors to flow more fuel under nitrous. So, use an injector size that corresponds for the kind of motor build up you are going to have. A pretty much stock LSVtec can use stock LS/GSR/ITR injectors.
4. Vtec solenoids are not different between the GSR and ITR.
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2015 Ford Mustang GT Fastback - Ingot Silver - 6M - Performance Package - Gibson Catback, JLT CAI, FR 47lb injectors, BAMA E85 tune, Eibach Sportline, BMR wheel hop kit, UPR oil separator, Steeda shifter bushing/bracket
Team B.O.B.® - Ballaz on a Budget