Stock fuel pump specs.

[SunbirdMan]

I went to Delphi's site and looked up specs on their pumps. Their vehicle look-up said FE0003 is the part number for my car. (78 Sunbird 305 cid) The operating pressure is N/A (edit: I found where it states: Relief Pressure 4.1-6.5 psi), and the flow rate is 23.9 grams a second. 23.9 x 60 secs x 60 minutes is 86040 grams an hour. 86040 grams converts to 189.685 pounds. Going on the high side of 6.5 lbs per gallon, this comes to 29.18 gallons an hour . Back to Delphi's site, their vehicle look-up didn't include 1976 Astre.
I found a bunch of automotive calculators here:
http://www.slowgt.com/Calc1.htm
and using the Fuel Pump Capacity Versus Horsepower calculator and reducing the hp a few times (using the default BSFC of .42) came up with 430 horsepower possible with this Delphi pump.
I could have screwed this up somewhere so don't take my word for it.

[gt350fme]

Hey Astro, if your car still has the L4 fuel pump in the tank, I would think its time for an upgrade to feed that hungry V-6.
I will definitely need to upgrade mine too for the v-8, haven't decided which pump yet.
The Delphi pump Sunbirdman researched should supply .48 GPM at 29.18 GPH if our math is good, that would work just fine.
I may use a higher pressure EFI pump with a bypass regulator and return line to the tank so my pump will be EFI ready when I eventually get one, Holley 600 CFM for now.

[spyder_xlch]

I may use a higher pressure EFI pump with a bypass regulator and return line to the tank so my pump will be EFI ready when I eventually get one,

That's thinking ahead. Saves money in the long run too.