Milling the Heads How much?

So I have done more reading than I think should have. I have decide to rebuild the engine and this what I have figured out so far. KB167 pistons, scat rods and 302 casting heads. I will zero deck the block, on the heads I will build them with 1:88/1:60 valves. I will reuse the cam I have 430/444 lift and 268/276 duration. If I used the compression calculator correctly this should yield me about 9.1:1. I figure I should be in the nieghborhood of about 300 hp. I have alot of planning ahead of me, since this will be done next year..........