164 teeth is the standard tooth count for an AMC L6 or V8, you should be able to use the starter you have all ready. Do you take the Jeep out wheeling much? If you do, think about getting a 2 to 1 starter. If you kill the motor on a steep hill, you can leave it in 1st gear 4-low and start it with the clutch out and take right off without spinning or frying the clutch.
1979 CJ5 360 V8 w/Holley 470 Truck Avenger, HEI Ignition, Livewires w/E3 Sparkplugs, Hedman Hedders, Flowmasters, DANA 30 w/Auzzie Locker, AMC 20 limited slip "N" 3:54's, Tuff Country 2.5" lift, Rancho RS5118, Rubicon Express Quick Disconnects, Currie 1/2" lift Heavy Duty Greasable Shackles, DANA 20, T150, Mile Marker PE8000 w/MiFi Controll Box, Bestop Super Top, Warn 6 bolt Premiums, 31x10.50x15