It depends. Do you have forged or hypereutectic pistons? Check your vacuum pressure, if it's low, then don't even bother.....
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1988 5.0 notch: Previously never modified!! 
SN95 block front and rear seats, Mac catback, BBK off-road H-pipe, Steeda castor camber plates, Steeda lowering springs, Tokico shocks/struts, Alpine/MBQuart/PPI audio mods...
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