I ran the stock pump on my stock 350 and never had a problem. I only upgraded because i was in the position to throw down the necesary green for a new one out of jegs. The nice thing about an electric pump is you can set it up to have an over ride switch to top off the carb for an easier start. My tank suck the fuel out of the lines "slowly" so I just jump it and top it off every day that i drive it.
I'm sure weve all had the mechanical pumps and turn the motor over, and over, and over waiting for fuel......
g