there's a difference? cast about your mind and see if you can come up with some wiring a V8 has that a 6 doesn't .... 2 spark plug wires?
the only electrical parts you might buy that need to be specified 6 or V8 is that ignition switch, and that's a matter of having the solenoid start position, which actually could be on a 6 as well .... if you're expecting to find a harness that has the identical connector[s] as yours on the ign sw, forget it, originally some trucks had one large plastic plug that all the wires went to, some had one plug with about 4 wires + a few single ones, some had all individual connections, doesn't seem to be any pattern I've seen, certainly not engine size .... both the 6 and 8 wiring has the same number of connections possible and the diagram in the 57 shop manual will cover it as well as the instructions with the new harness
Bill
