According to my 1963 Chrysler parts book:
2402528 choke thermostat is for 170 and/or 225 engines with Holley carburetor numbers 2533, 2534, 2535 and 2536 and 2538.
With Carter 3462, 3463, 3464 and 3465 carburetors, the choke thermostat is 2402526.
Hope this info helps.