My '55 originally came with an I6, but now has a 5.4L DOHC Ford engine and I now need to buy a radiator.  The ones I came across say they are for the V8 only.  Is there a difference in the mounts/anything else besides cooling capacity between the I6 and V8 radiators such that I would need to source an I6 radiator?  I obviously need the V8 one now especially living in Las Vegas where it get to be 110 plus in the summers. 

Thanks,

Dave