With that cam, you'll want to be somewhere between 9.5 and 11 to 1 compression ratio. You need to know the cc displacement of the piston domes before you continue. You can probably get by with up to 11 to 1 with a good tight squish of 0.035" to 0.040", good gas and reasonable spark advance. You can figure the dome displacement by reading this paper I wrote....
http://streetmachinesoftablerock.com...opic.php?t=124