Tell him to show a dyno sheet, or else he is bs'ing for sure, also, check and make sure its not a 392 stroker with 11:5:1 compression, and it still wont make that kind of power even if it was, 520 at the wheels will put him in low 10's imo.
That much hp would snap that t-5 after all those original miles, also, you wont find many stangs making more than 400hp with unequal lenght headers, not n/a anyways.
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Police package 5spd 90 Lx, Stock original motor, 3.27grs, BM fan, fms 10.5 clutch, D&D quadrant, and adjuster, ADS chip, 180 stat, mac cai, mac h-pipe, mac subframe connectors, ASP crank pulley, ripper shifter, 26x10.5 M/T sport pros welds. 246 hp according to analyzer 
Race weight: 3,120
E.t-13.57 with 26x10.50's e.t. streets. 1.88 60'
mph- 99.92 mph
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