Yea dont change a good thing, at the most, put on a small shot, maybe a 100 shot, you will need a cage if you dont have one, basically what 1bad says, plus assuming your car is hydraulic roller cam, you cant be spinning the motor to high if you want it to last, my friends 347 runs real well with fully ported trickflows, combined with a victor jr. intk, just a thought if you want different heads.
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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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