In my signature there are two links regarding solutions for running lean. The first (181) was solved by adding the Pierburg pump. When I added a smaller SC pulley with the 181 (stacked) the Pierburg was no longer enough. At that point I added the 550CC injectors and was seeing plenty of fuel even at 23psi. Keep in mind, that's with stock fuel filter and fuel pressure.

- 181 Lean solution
- 185 or Stacked Equivalent Lean solution