I want to put a single choke carb on my 602 I have the manifold and have a choice of 5 carbs some have 34PC1S 6 on them some have 34 PC1S 10 on them some have an adjuster on the bottom near the butterfly (some exposed,some sealed) and one has another adjuster at the top of the carb as well.. one has a working dashpot on it.. all of them if you measure the width of the butterfly hole its 34mm .. question which would be the best one to use or should I go for the one with the least amount of wear in the spindle.... do I set the float level per haynes i.e. run engine stop remove float and measure down to the fuel level..