Yeah copied and pasted the wrong blurb, this is yours:

Bosch 910 Fuel Pump Specs:
Bosch Part Number: 0580254910
Minimum Current: 12 Volts
Operating Pressure: 72.5 PSI (5 Bar)
Minimum Flow @ Outlet: 34 GPH (130 LPH)
Fuel Pump Location: In-Line

Its still almost double the flow rate.

Im unsure how much of a problem it will cause, but its not ideal obviously. Ideal would be OEM spec. I think the Walbro in my car is 160lph but I have a 20v with slight greater thirst for juice, and I upgraded my return line to the same size as the supply.

I think you wont know till you try. Why did you decide to change it, did the old one die? I think a fuel pressure gauge would be the best way to see if this is the problem before you spend the money on a different pump or pull anything apart. basically the fuel reg should maintain a constant 40 something psi, unless anyone can confirm exactly, as Im used to 20vs and am unsure how exactly this pressure differs. It should however be constant as you rev the car up, if it isnt then you have the issue as described I would say. Im no expert, but I have seen a few curious issues like this caused here and there with fuel pressure issues.