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D2 heads are small port but a good chamber, however they have a different exhaust port (like the C8AE-H and C7AE-A too), so headers may not line up depending on what you are using.
My guess with a Cobra, you'd want the early exhaust port
My experience with the 390 blocks, pick the one that is in the best condition. However, if you wanted to really be serious about it, magnaflux both and sonic check and the one with the thicker walls would be what I'd use
(Sorta, in real life if the first one was good, I'd stop there) LOL
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