Fueling & Injection - Which model walbro 255 hp for C6 ffs in tank?

my car is an 03 1/2 Z06 , so I have the C6 type ffs fuel system. In that Iwill be dropping the tank anyhow, I thought that I would replcar the oem in tank pump witha walbro 255 lph hp.

I've been told that either the 341 or 342 would work.

Anyone know for sure?

thx

:cheers: