MPI is great BUT the new TBI self tuning systems like the fast ez efi and powerjection give multiport a run for the money, the new style TBI systems use high pressure injectors as well as wide band 02 sensors, the bummer with the ez-efi and powerjection 3 is there is no ignition control and the ez-efi is not laptop programmable like the powerjection 3, I bought a used powerjection 1 system which has the self tuning feature but also has ignition control and a returnless fuel system. you may want to look for the powerjection 1 as they are still around. No major changes are required, you can use your existing intake etc....and make power like a finely tuned carb but with the drivabilty and economy of efi.