We would need the exact piston specs to get really specific. I used your figures to calculate the resultant 9.4 to 1. It depends on what you want to do and what gas you want to burn whether you have enough comp./torque/HP. I run stock compression and high octane gas because I would rather pay for gas and get all the BANG.

Here's a likely aftermarket piston:
http://store.summitracing.com/partdetail.asp?Ntt=l2262f&N=0&part=TRW%2DL2262F&autoview=sku&Ntk=KeywordSearch