I'll say it "could" pull in the upper 400's HP range. I wish the heads flowed a little more and the carb will be too small for max HP. However, the smaller carb will make better torque numbers. With the 650 carb and 241 cfm heads I'll guess...
462 HP @5400 and 500 ftlbs TQ @3400 rpm.
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Good luck to the new owner of the Ventura II! Sold the car after 13+ years. Look for it on the Hot Rod Power Tour in the future as it's currently being re-configured as a Pro-Touring ride! 
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