1986Gt stock motor advice

How much extra horse power can you get out of the 86 motor without changing the heads? Are the stock heads worth porting? I have some E7s that I want to install, but I,ve been told that I may have to have the flat top pistons fly cut,to get p/v clearance. It currently has underdrive pulleys,cat back exhaust,msd coil&wires. Any advice is appreciated
 
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