94ford5liter

Was looking around for what psi it should be at with the vacuum line on and can't find it anywhere. Manual isn't very specific, just says 30 to 45. I know on my 94 gt stock it was like 38, and it was like 45 when i had the heads/cam. When I got my car dynoed yesterday with the stock fuel regulator they said it was running lean and I should turn it up a couple pounds. So I bought an aeromotive regulator, which was preset at 48, so I turned it back down to 43 psi. I was just wondering what the stock psi is so i can turn it a couple psi above that.

AdderMk2

i was running 39 psi with the vac line disconnected