how to get comp ratio?

[cobrashoch]

Don't know anything about the new Kaase heads or the new twisted wedge heads for 460's. The only applications I have seen on the Kaase head was all on 500 cubic inch or less engines. And that was only info I've gleemed from the internet.
From the way you described things I would say that you will be O.K. though. In the past all the 385 - 10 to 1 motors I've seen will run 93 unleaded with aluminum heads.
There is some things that you can do to help yourself though. Polish the pocket domes of those heads till they look like mirrors. This will eliminate hot spots and allow you to run higher compressions. Takes only a couple of hours work to do this, using steel wool, Mothers polish and a rag. Retard your ignition to start with when you first fire the engine up. You can always advance it out a later.
I wouldn't run any more than a .65 lift hyd. cam on the street, .67 on a roller with 10 to 1 slugs. So have those heads set up in advance for those lifts or better, because you may want to change cams later. On the heads- use a double spring setup, not a triple spring setup on the street. Triple spring setups usially accelerate valve seat wear.
I also openly question the costs of those Kasse heads. I wonder out loud if you will get the most return for the performance dollar spent going that way. That's something only you can determine though. Lots of luck.
cobrashock