Honestly on that motor, and the stress you put on it, I would just try to get some Efans that pump more CFM. To my knowledge (this is basing off of old SBC's) a standard SBC will normally require about 2700-2800 CFM, so I'd look into upgrading your fans. You might even want to look into a 90-95 ford taurus fan, can be had cheaply with replacements out there and I believe it does about 4500 CFM or around there, and it'll have a shroud.
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