Not Ranked
Saw this head at the pri also Keith, is typical of Don's work as far as I can see. Since the port (int.) looks similar to the smallblock stuff, I would guess that the .500 numbers are in the 350 zone.
We have been running Don's heads on our smallblock for a number of years and have set the NHRA SS/BM record with them.
I would guess that the carb height would have to be pretty high in order to make a proper transition into the head. Possibly too high for most cobras.
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