a little..the stock 4v carn is around 570 cfm.. I think..
none of them are going to bolt up without fuel line mods...
but I think you could swap the bowls off the stock carb to the new one... then it would be pretty much the same..
if you get a 600, get the quick change secondary spring kit and put a lighter spring in so the secondaries open quicker.. for that matter, you could put it on the stock carb, and see if it helps.. then move it to the new carb later :-)
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