your intake as no vacuum ports .what did the engine have for vacuum in gear at idle with old carb ? then that would be were you could start i cut the reading in 1/2 so lets say you had 8 inchs of vacuum in gear i used a 4. or4.5 power valve if less then 3 inchs at idle i plug them then jump up on jets size so if you plug the power valves in the new carb any were from 90 to 94 i would start on the smaller size jets.if race stuff i just plug the power valves