Fuel pump question

[DSYenko]

Is there any difference in factory GM fuel pump outputs or pressures.I have built a street performance 454 with 400-450 horse and used a 74 454 block and a 750 Holley and was wondering what fuel pump to use.I am trying to keep it stock looking but was'nt sure if a LS6 or Vette tri power pump had more output than the average GM pump? Also thought maybe they were to big to use without a return line since the heavy hitters in the later 60's had a return line .I am putting the engine in a 76 Malibu and it has NO return line.Any knowledge on this would be appreciated,Thanks Duane