2.7 guru which Piston?

[10zz964]

my engine is going to be open for a rebuild.
From my research on this board and wayne engine book.
2.7 engine mod and upgrade
1. RS P&C, s-cam, carb or MFI same comp ratio
2. from this
http://www.pelicanparts.com/techarticles/911_engine_rebuild/911_engine_rebuild2.htm
retain CIS, 964 cam, hi com piston up to 9.5:1, or even 9.8:1

i went thru my part bin and i got webber (size 40) and a pair of 964 cam.

1. should i use webber with 964 cam?
2. RS piston with same comp
or
Hi com piston
above with webber.
this will go into 1966 swb with 915. i am looking for more fun (car is street use mostly and some trackday)and since i already have 964 cam and webber, streching to a set of new P&C is still in my budget.

we have only 91 octane fuel here, if that make a differnce.
emission control is not an issure here.
cheers and thanks
tenn