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I'm with mr. fixit. your throttle blades are not closing far enough. Take the carbs off. Turn them over. The small flat headed screw controls the secondary throttle blade. Back the screw off until the blades close almost completely. Give it 1/3 to 1/2 turn (clockwise) Put the carbs back on. Try that.
If that isn't it some older 4160 carbs used a reverse mixture screw. tightening the screw actually opens the idle mixture. You may have those BUT 3500 rpm isn't an idle circut problem. You are running on the main circut. (I suspect the secondaries are open due to the throttle position see above)
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michael
A man that is young in years, may be old in hours, if he have lost no time. But that happeneth rarely. Generally, youth is like the first cogitations, not so wise as the second. For there is a youth in thoughts, as well as in ages... Sir Francis Bacon (1561-1626)
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