P72 head/b18b block & ctr pistons

I currently building another lsvtec and I have a p72 head and a b18b block and thinking about throwing in some ctr pistons I was told that compression would be at 12 but now im being told that the compression is goin to be at 13. I know I have to retard the timing and all but I'm thinking now this wont be a good daily driver
so should I do it or get another set of pistons, and If i do go with the ctr's what other procedures do I go thru, as in parts or block modification