You need to know the whole combo. What pistons, what heads, and what cam? Very generally, under 8:1 will feel soft down low. 8-8.25:1 is about max for open chamber iron heads. 8.25-8.7:1 is about max for closed chamber aluminums.

Well, art is art, isn't it? Still, on the other hand, water is water! And east is east and west is west and if you take cranberries and stew them like applesauce they taste much more like prunes than rhubarb does. Now, uh... Now you tell me what you know.