1 Walbro GSL-392 will just about out perform an A-1000 for 5 Times less $$ and a whole lot quieter too!
Here is my set up. 10an from tank Pre Filter to to another Filter under the manifold to 10an in 8an Y to both fuel rails with a 8an return off the Regulator.
All 3 of these running at the same time are quieter than 1, A-1000. Three of these will smoke it big time in the performance department. This set up is good for at least 1400 Boosted EFI Hp.