I would not use a Mustang II on a 65 F100. One of the things you need to pay attention to, something I have been harping on for many posts is braking loads. The MII is not up to the task to stop your 4000 pound plus truck. Not to mention how much you need to alter the suspension geometry to make it fit. Like your old man used to tell you, "there is an ass for every seat". He wasn't kidding around. I use Dodge Dakota based suspsenions for those applications. LUX and many others would use Camaro, Some would use Volare' or Jag suspensions. All would be much better suited to holding the 2500-3000 pounds of weight just on the front wheels and stopping that much mass. Plus the track width would match much better.