fuel pump

after converting a 197/200 to 225 engine its clear the standard fuel pump is up to the job but at what point do you need to upgreade ? 300 bhp 320? 340? etc
 
Standard clio pump is good for 310bhp with 630cc injectors according to Paul at rs tuning.
 
Walboro 255 is a good upgrade and can be made to fit in the standard pump carrier.