Isky 264 Mega in a 400

OldmanRick said

I have never run one, but the specs look great for what you say you want with the 9.5 to 1.

Only caveat would be that with iron heads you may have to pay strict attention to your timing curve running average pump gas

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Yes. I can get 93 octane on any gas station where I live. I'll have to be careful with the timing curve, but I think it's doable. I just wish all these old iron heads had a quench pad like the small block chebys, i'd push the compression up a hair.