Ford Repair: compression ratio??, rodrigo costa, aluminum cylinder

Question
HI
A have 67 mustang fastback with a 302ci (1974) and want like everyone else more street performance so I recentry bought the edelbrock RPM package: aluminum cylinder heards(60229), intake manifould (7121), cam,and timming chain.
but right now I want to buy some pistons that performs better for this package, and saw a speed pro forged pistons (TRW-L2488F30) they are for 9.53 compression ratio and a chamber of 63cc. My question is: what happen if the chamber of the cylinder  head is 60cc and the chamber for the piston is 63cc, does it will have more or less compression ratio(in wich range) and if it is more compression does I will be to much for street use?(ex,demand especial fuel?)
thanks very much, I apreciate your help that you allways supplies for us.
Rodrigo (Costa Rica)

Answer
Rodrigo-

  It won't change the compression much at all, but it will bump it up just a bit.  My guess would be somewhere in the range of 9.6 or 9.7 instead of 9.53.  A difference of 3cc's won't make much of a change.  And you really shouldn't need special fuel.  Hope this helps.

Steve