383 with Eddy heads!

IQ52 said

Nope, I ain't tellin'. You have enough information, if you read back through the posts, to make this decision on your own now, and take the responsibility for it.

What does it cost to rebuild a set of factory iron heads with new guides, valves, springs, seals and have them ported to the level of the Edelbrocks? You know the ones I'm talkin' 'bout, those "garbage" heads.

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You will spend more to get the 516's done than the Edelbrocks will cost new. Not to mention the weight savings. I have worked 516's on my 383, they work great, but it took many trips on and off the flow bench, and the Edelbrocks still flow more. Mine were done close to 15 years ago, and I had close to $1,000 in them back then. As far as compression goes, I like it as high as you can get it and still run an aggressive timing curve without detonation.
IQ52 has forgotten more than I'll ever know, so he may correct me on that. I wouldn't be afraid to shoot for 10.0/1 with aluminum heads at all.