There was a local guy to me that had the next size down thumper HR cam in a 400 with round port E heads. My friend built it, was about 10.7 compression. It was right around 350HP on a wheel dyno thru mufflers. It was a 4 speed car, maybe 420-430 ish on an engine dyno. Did ok, not great. He pulled it and built a stroker.
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