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My IAG stage 2 was 12.5:1 compression ratio and i run a flex tune with 93/e85 but mostly e85. I did get the gsc valve spring titanium retainers. They told me that it could handle 8200rpm and 20psi and something like 580crank hp. That is more than you'll ever be able to put down on autocross.
IAG told me that bigger valves and beehives weren't worth my money so ymmv. I do have a killerB pickup and a bluemoon baffle.
Also going to 3rd and say go with a built short block at least. Even with donor heads, the cleaning and machining alone will cost an arm and leg so if you might as well.
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