There should be obvious changes under the hood for an engine putting out that much power.
Different heads, intakes and headers would be some of the obvious things you would notice.
Take it to the track and see what it runs. You'll find out for sure if work has been done or not.
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'82 GT 351W (.060)Comp Cams 274* Extreme Energy cam, ported & polished heads w/ 1.94/1.60 valves 10.3:1 flat top pistons,stealth intake, Mallory dizzy,Holley 750dp carb, BBK shorties,Flowmaster exhaust,C-4 with 3700 stall converter, B&M pro shifter,8.8 rear, 4:10's, subframes, electric fan, powermaster alternator, 4 core radiator.
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