R3 Block Question

I am not sure on the flow required.
The engine will make around 650hp.

I have found these 2 pumps.

I have read good reviews on this pump.
http://www.claysmithcams.com/mopar-a-or-small-block-chrysler/

Also seen good reviews on the RobBmc, they will make me one to suit.
http://www.robbmcperformance.com/products.html