anyone narrowed a ff d60 rear I'm looking to put one under the toy I have found two full floaters for $100. both out of fords one is a 68 and the other a 75 model. is there any thing I should look for as far as weakness and is there an advantage in one year or the other. I'm a big chevy toy buff but don't have a cule about fords.

How big of a deal is it to narrow to about 58 to 60 inches. and what is required.