Fuel pump size

I have the following mods listed below but I never changed my fuel pump. Every now and then when I try to start my car it will not start but on the second attempt it will fire up. I already replace the fuel filter so my guess is its the fuel pump or regulators. If you think its the pump what size pump should I go with I'm planning on upgrading to a cam real soon. :shrug:
 
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I had a bad high rpm lean condition on my stang a while back, so i just put in a Walboro 255lph fuel pump. It works great. It wasnt over kill, your car only gets as much fuel as the injectors allow. So i figured why not give myself room to grow.