Just got the motor running and installed a vacuum gage. It has 5" at 1100rpm's (idle), 10" at 3000rpm and 15" at 4500rpm. I didn't take it any higher because I heard that the vacuum should never be over 10". If I have 15" at 4500rpm's, it's gonna be way over 10" at 7500!! I have a bleeder in the valve cover that uses carb jets regulate the vacuum.? How many inches of vacuum should I be looking for?