Which Walbro should I get?

I have a 92 Civic, and there is an 85% chance my fuel pump is bad because when I drive, power cuts of for about 3 seconds every 20 seconds,(feels like I let off the gas for 3 seconds when I didn't) and I already changed fuel filter, plugs, wires, cap, and rotor. What I'm going to do is get a Walbro after I do my B20 swap. The question is which one should I get the Walbro 190lph Fuel Pump, or the Walbro 255lph Fuel Pump. I will be going NA all the way with moderate mods. Also will these pumps make me burn more gas.

might as well get the 255lph model so for future mods you wont have to worry about upgrading the pump again., make sure you get an FPR though.