Do I need a fuel pressure regulator?

I just got my motor put in and I need to replace the stock fuel pump. Whenever I give it more than a 1/4 peddle the car doesnt go anywhere and the fuel pressure goes down. I was going to put in a 190lph fuel pump and was wondering if I needed a fuel pressure regulator or if everything would be fine with just the pump.
 
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Replace the pump only if you have observed the pressure drop on a fuel pressure gauge as you add power. First, replace the fuel filter & check the fuel lines for damage.
 
My friend just had this problem on his mustang, and it turned out to be a messed up fuel filter. Replaced that and problem went away.

But as for a Adjustable Fuel Pressure regulator...that was my first engine mod...i think? if not it was the second.