Hi Guys

I asked this question in the technical area but no one has any answers for me, Hoping someone know in here.

Im haveing trouble finding out what i need to do in the way of a fuel pump. Im having the engine built to 550bhp and need to know whether a gpa 044 is enough or if i need twin fuel pump. Ive heard conflicting stories about fuel pressure and i beleive that a grp a one is fine but would like to know 100% before i order

Thanks