You can change injectors if you need to on the MPI. I don't know what size they come with or how to know how much HP they would support. For TBI you can use a BBC throttle body. They have a larger throttle bore and injectors than the SBC one do. My buddy did that a couple of years ago by using the TBI that was on the 454 I have. He bought a stand alone CPU and harness from Howell and converted his Jeep 360 over to EFI.
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