stock mech fuel pump

does anyone know the flow rate of a stock mech fuel for a stage 1? I've got a 1970.

 

I have heard anywhere from 4-7 PSI. The pumps can actually vary from pump to pump.

 

I wanted to know GPH. I have an 850 holley jetted 80 and 88 with an alum b4b intake. The mech. seemed to keep up ( although it did fail) but I replaced it with an electric pump flowing 90 GPH.
Is this a good combo or can someone recommend a good electric pump with 110 GPH and 7 psi?

 

Also, the mech pump had a vent line from the tank to the pump. Should I now block this old vent line or just not connect it to anything?

 

Looks like about 80 gph at free flow (0 psi) and about 40 gph at 4.5 psi.
Source: http://www.robbmcperformance.com/products/buick1100.html