You also need to check out www.chevytalk.com and maybe the discussion board at Salley cheverolet for additional insight.

For streetable performance you are going to want the compresion ratio closer to a maximum of 10:1. Maybe 10.5:1. Otherwise you will find your engine requiring at least a mixture of race gas with every tank. Been there, done that and it is a royal pain. I ran a 350 in the 1980's up near 11:1 and had to index the spark plugs to keep the pinging in check. And you can get plenty of performance with lower compression ratios .............

Good Luck, Kitz