My roomate has the GSR block with LS crank and rods in it, it hauls ass even with stock cams. As for building the LS for high revs, all you really need to take it to 8k is ARP rod studs. If you wanna go higher, you better be built, and have everything that inspyral mentioned.
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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