PI Head swap or ?????

Ok I have a question about the PI Heads... I found some from steeda fully assembled for $350 each... but what will just porting and polishing the stock heads on my '96 GT do??? will that give me close to the same effect??? and can you put Cobra DOHC heads in a GT with new timing chains??? would you have to change the computer and alot of other stuff???

Later
Jake
 
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