You need only 1 of part #12568332, its the injector assembly, includes 6 injectors and poppets and the old connector just plugs right in. If your intake doesn't have any wet spots in it, I wouldn't spend the money on the MFI. So how was the fuel pressure, 60-66psi key on engine off, did the pressure fall when the pump shut off?
Here are some pics on another site of a V8 engine getting MFI
http://www.pacific-audio.com/perform...es/231640.html