Any suggestions for water pump
I am looking at

1576 1968-70 OLDSMOBILE 455 5-5/8" TALL FOR AC CARS WATER PUMP

https://flowkoolerwaterpumps.com/products/1576-1965-70-oldsmobile-455-water-pump-ac-5-5-8-tall

 

The 5 5/8 is correct for 70' a/c.
The flowcooler pump is just a GMB pump with there fancy purple impeller.
I have installed both a GMB and a flowcooler and saw no difference.
My opinion, not worth the extra money. Just by the correct GMB brand pump and save your money for other things.

 

I agree that it's not really worth the money. Several years ago I debated installing a FlowKooler pump in my car since I drive in 110+ summer temps with the AC on, but I opted for a parts store rebuild with a stamped steel impeller instead. And whaddaya know, the engine runs right at the thermostat temperature with that inferior impeller.

 

HMM GMB is Much cheaper, by like 50%
https://www.carid.com/gmb/engine-coo...-130-2926.html