Carb tuning problem

[sandmanmike1]

I have a slightly modified Ford 2.3 out of a 86 mustang which I currently run in my sandrail. Motor has been bored 30 over i have a lunati cam model 32904 cam specs are attached. I am running MSD coil vacumn advance distributor with blue brain box. I am running a fuel injected intake with injector holes tapped and plugged then filled with epoxy. My friend made me a billet adapter to mount a holley 4 barrel. I was running a 390 4 barrel but it wasn't getting enough fuel so i went with a 600 4-barrel and it has a slight hesitation when taking off then runs like crazy. Would it help if i went down a couple sizes in the jets. I had to back off my timing also. Any help would be greatly appreciated