I have a 1990 mustang 5.0 auto Lx with gt40p heads, gt40 upper and lower intake. I was wondering when I replace the fuel pump, does it matter if I install a FLOW: 255L/H pump? Would I need to change anything else or would it be better to just keep the same FLOW: 95L/H pump in it? It still has the 19lb fuel injectors if that helps any. Thanks for any help or advice you can give.