First. Please register. You will get far more responses when you do. Members respond better to other members.
Now to the pump. Save your money and don't buy any aftermarket pump. Replace your original, only if it is damaged beyond repair. Your OEM pump provides more oil than the engine will ever need. And, the scavenger can remove more than the feed can provide. This eliminates the need for restrictors. Your engine needs a steady flow of oil to lubricate it's components. As there is no way to measure flow, pressure is the means to measure this. Your OEM pump has a factory recommended setting on the pressure regulator. If yours is an original for your engine, you have an adjustment on the regulator, just under the cap. Set it to the book. Then, when the engine is hot, you can adjust this to a 5 to 10 psi setting, observed at a fast idle. You will have to attach a gauge to the port where the pressure switch is mounted. Don't adjust while engine is running. You will have an oily mess coming out around the adjuster. Run, check, stop, adjust. Run, check, stop, adjust.