I think HP wise If the 95 motor made 100 hp and an equallyworked88 would be within 3-5 HP of that.

Its the torque that you will miss out on.

I think with a good cam/exhaust and tuning you will be happy with porting and cams.

 

From all my reading, I kinda thought that might be the case.
Marsh

 

A lot of your power is just gonna be from raising the compression when putting in new pistons, not the xtra 7 inches.

 

But if you are going to take the heads off and put in new cams anyway you might as well make it a 95incher. $150 to bore and hone cylinders and $2-400 for pistons depending on what you go with isn't that much more for a great boost in torque.
Remember "there is no replacement for displacement."