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leave your fuel system alone. It is good enough to support more power than you will ever make unless you are running some form of boost like turbo/nitrous.
The walbro 255lph is an 800hp fuel pump. The 190lph is good for about 600hp. So needless to say, either is way overkill and if you use them, you will have trouble getting your fuel pressure correct at idle.
A fuel pressure regulator is a waste unless you have done some serious work to the motor like an intake manifold, cams, headwork, etc.
A vafc would be a waste of money as well on a motor with bolt-ons.
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