ive never seen a c4 behind a smaller motor .... usually c6 is on 351 and up .....

i got a c6 that needs rebuilt

yeah i guess its one of the weird 67-72 f100's that came from ford, doin research ive found that ford did some strange things with some of the trucks that rolled off the line in those years. mainly the ones that came from the detroit plant.
the c6 is still in the truck i just need a rebuild kit