My quest for a 9, I failed.

Thumper built my carb and installed .128” bottom feed needles. His instructions were to run 5 1/2 psi. My current pump is a Holley billet 150, I have a Magnafuel 275 that needs resealed. I resealed it once and it leaked again in short order, may give another try.
You may know this but Magnafuel "warrants" their pumps indefinitely. You can send it back to them, they go through it and replace anything needed then flow test it. All you do is pay for parts. I have an older 275 (maybe 10-15 years old) that quit. Called them, they said send it in, and sent me back essentially a new pump only reusing the housing. Cost less than $70. I was impressed!