Many comp engines are built at 16.5:1 compression. Like said before it depends on what gas you want to run. You will be wanting 116 or better fuel when you get over 15:1.
My 421 W8 was 16.5:1 and it preferred 118NOS fuel which was illegal in the class I ran.
Leon
Career best 8.02 @ 169 at 3050# and 10" tires small block power.
