Need to make a decision fast 5.7/6.1/340

Regarding fuel system:
Carter 4600HP $115
BC Bronco's fuel accumulator - $70
Walbro GSL392 $110
Wix. 33737 - $40
Fittings, etc - $100
Cheapest EFI fuel system that will handle 600 hp

Carter 4600HP is the pump? What does the fuel accumulator do? And what is the Walbro GSL392?

Is it only the A-body that nothing works with power steering? I thought I saw a set of TTI's that said they'd work with PS, but that might have been for B-body...

Sorry. Wasn't trying to hi-jack...