Water pump, A/C vs. Non A/C???

Lol. I just looked in my FSM for 1967 Dodge Dart.

273, 2 bbl, 4 speed and auto trans w/ A/C: 4.20 diameter impeller w/ 10 blades
Same as above with Clean Air Package: 3.50 diameter impeller w/ 6 blades

I havent even seen a 10 bladed impeller yet.

Just measured the impeller on my 8 bladed A/C unit at 4.20. well it is the same as the original. Hope it all works out!