I'm building a 50 ford truck and plan to use as many parts from around the garage as possible. I picked up a rebuilt 5.0 at a garage sale, all parts seem present. Block #E7TE with E6SE heads, I have an HO 5.0 intake also. I heard some engines had different firing orders and you couldn't mix and match intakes. Could someone shed some light on this and guide me in the right direction. This is my first EFI project.