I want to swap a 351C into my 1978 Mustang II. It has 4 cylinder & C3 in it now. Anyone else done this swap? Looking for motor mounts, headers, etc.

 

Just did a quick search out of curiosity, looks like you'll be fabricating a lot of things to make it work. Most of the stuff available (or at least it was) is for a windsor and won't work with a cleveland without modifications

 

I searched as well and didn't find information on much of anything.
I did read something about using convertible Mustang motor mounts, supposedly the 302 mounts will work with the 351C.

 

Seems like the biggest issue is the size of the Cleveland, and trying to fit headers between the strut towers. Regardless, it doesn't look like there is any sort of "kit" you're going to be able to buy to do the conversion. Looks like it's been done plenty of times but there really isn't any plug and play type setups for them