Yes a 97 would be an obd2 block, although the sensors relating to obd2 are on the intake manifold, tb. If you're gonna run stock LS internals in your GSR, at least get some ARP rod bolts...the stock LS bolts won't hang at 8k rpm, especially under boost.
__________________
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