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Whats also interesting on the MBE website is the Pro Stock 4.9" Mopar small port heads, where they are recommended for engines 430-450"...I wonder what they flow and how they would do on a 500" engine for the street?

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Are you talking about the P5 small block head or the 99 BB head? The small port BB head from my understanding is over 570cfm. The large port version goes 625+. They are still going ot want a TON of RPM to work right. That is what all three of those heads are designed for RPM. Even at 650 cubes they still want 8300+ from what I have seen. I know there are a couple of larger cube 99 engines goign together around here right now. be interesting to see what they end up with RPM wise. Those are BIG heads no matter how you slice it. I know mine sounds really good at 9500rpm