All cylinders filling with water

HemiTM said

OK....I realize I am not making anyone happy by choosing to torque them at my own pace. But, I will finish them tomorrow.

As for the intake. It is a single plane M1. It only uses the front water passages. It was sealed very well. Intake gaskets looked great. Where would it crack at in order to get water to the intakes. No evidence of any damage at all.

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No one is saying it is or isn't cracked but the basic idea here is that there is likely a cooling source/passage that somehow is common between both heads. The most obvious culprits are the intake or the water pump.

Did you take the timing cover back off? There's those two passages on either side of the block right behind the water pump - what's in between - the water pump, right? (a common source feeding both banks) Is it a high flow type or have extra blades on the impeller? Are your pullies underdriven? Maybe a gasket is covering up the passages? Clutching at straws here.