I would not go .040 over. I think that you might not be able to go that big on all the cylinders anyway. You should just go big enough so that they can get the cylinders into the correct shape.
A 2 bar cal will allow the computer to supply fuel up to 14 psi. Anything higher you would have to supply with higher fuel pressure or extra injectors. A 3 bar cal will supply up to around 28 psi without any extra injectors.
What calbration you run will determine the size of the injectors.
I have a common block 2.5 boared .020 over, TU 3 bar cal, 2.5 exhaust, + 40 injectors, 555 tranny in my 85 Shelby charger. I think you made the right decision with the 3" exhaust.
A 2 bar cal will allow the computer to supply fuel up to 14 psi. Anything higher you would have to supply with higher fuel pressure or extra injectors. A 3 bar cal will supply up to around 28 psi without any extra injectors.
What calbration you run will determine the size of the injectors.
I have a common block 2.5 boared .020 over, TU 3 bar cal, 2.5 exhaust, + 40 injectors, 555 tranny in my 85 Shelby charger. I think you made the right decision with the 3" exhaust.