Bdud, keep in mind, Holley owns MSD, so it's unlikely that MSD's Atomic and Holley's equivalent have significantly different logic.
The Bosch 044 fuel pumps are the best value on the market. Great performance, super reliability, low noise and cheap price. Just be sure you are getting a real one. Counterfeits are everywhere, so be careful. Even Summit got burned. If you Google "Bosch 044 fuel pump" there are web pages that show you how to spot a phoney pump.
Using a smaller injector at higher pressure is a pro-tuner trick. It gives you better starting, better driveability and an idle you'd find difficult to achieve with a larger injector and lower pressure.