I would rather have the tighter quench with 11.00 to one than the .050 with 10.8 to one. I ran a 10.8 to one cast iron head with .038 with a .223 at 50 cam for years on 92 pump gas. Only time I had any problem was when the temp got in the high 90's. You would hear just a little in high gear. Couple gallons of race gas would fix it. With aluminum heads better combustion chamber shape and more cam duration I would think you would be OK.