Cylinder Head CCs and Compression

I am going to purchase AL heads and I want to increase my compression ratio .
I presently have 906 heads, checked 88 cc chamber volume , and my compression is 10.1
I want to increase my Compression with the new AL heads
Question
If I order a set of heads with a 78 cc camber will this increase my CR ? if so how much?
Tips , suggestions welcome
Thanks