i run 10.5 and that's perfectly fine for street. 11:1 is about my reasonable limit for a car that will see 91/93 octane gas. Nitrous is extra good on high comp motors. I see little reason not to do it. If you have the heads ported and remove the emissions mask/swirl dam then you'll be safely just below 11:1 with flat tops. I'd do it.
If you can do it, I really recommend the H-beams. Cheap insurance against a windowed block.
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