After doing a lot of research on the fuel pump issue I went with what was recommended by those in the know over at thirdgen.org's TBI section.
Firstly, it's ACDelco or nothing. You only want to do a job like this once. Aftermarket pumps are crap.
Secondly, TBI pumps may put out 13 psi if you're lucky, usually 9-12 psi. Any mods and 12 psi won't cut it.
A Tuned Port Injection pump can put out as much as 60 psi and is a direct, drop in replacement.
Don't worry about the extra pressure, your TBI injectors are controlled by your TBI's fuel pressure regulator, the excess pressure just returns to your tank. You can't overwhelm the system.
The ACDelco TPI pump is p/n EP241 and is $60 at rockauto, $66 at gmpartsdirect.
Standard replacement TBI pumps range from $26 up to the ACDelco TBI pump at $80.
So, more pressure and a better design for $20 less.
Stock Chevy TBIs run best at 13-14 psi, modded ones need 18 psi and up.
Just this morning I ordered the TPI pump from rockauto and an 18 psi regulator spring from TBIparts.
Rockauto also carries new fuel sender O-rings, gaskets, strainers and locking rings for dirt cheap, we're talking $1-$5 each so it's worth getting new ones.