FMX to C4 swap?

Should be a direct swap as long as the 351 is a Cleveland or a Windsor. However, you may run into problems with the neutral safety switch, cuz I konw for sure that in one of my 73's the FMX has a much different switch than that, that is used on the C4. Maybe the driveshaft as well from the 302/C4 combo, since the C4 is shorter than the FMX.