Berkeley JC vs JB vs JG

[thehotrodguy]

Other than the fact that the JC stock bowl flows more water, and the JB and JG are split bowl pumps, what is the difference?
I have a JB pump, rebuilt before sitting on the shelf before sitting the last 2 years waiting. I have an old JC pump in a 21' Hawaiian open-bow, and will be receiving the 521 BBF this week. Thinking I may change the pumps. They both run A impellers. I have a hyd place diverter for the boat as well.
Thanks for the help!

[twowheeledfish]

Sell both pumps you have and use the $$$'s to buy an American Turbine pump that fits your application. It will flow more water than either of your Berks. Just my two cents.