just pulled the fuel pump out and had a look what flow rate it is , looked it up but it is not that big a pump i thought it was (elite invoice said it to be rated to 500 hp )the previous owner may have taken the good pump out before he sold car ? so before i fit it back would like to know if it may need upgrading ? car had 327 rwk on there dyno

that's a 270ltr hour pump, I think it would be ok..
I had a gss341 (255ltr hour) in my turbo 6 making just under 300 and fuel system was supplying more than enough..

if your concerned get a better pump..
there is a walbro 485 ltr hour pump, that would be more than enough..

thanks for the information thats great ,don't have to a get new pump