As someone who has built two F-100’s (‘55 pickup and ‘53 panel), I can say that the 53 to 56 F-100’s are worth more customized than in original condition. Just go to any truck show or meet, and you will see. In original condition you will have an ill-handling, underpowered, hard-to-steer, hard to stop, truck. Customized, I had excess power, independent suspension, disc brakes, power windows,power steering, a/c, etc,etc,etc. Just don’t plan on making money, as it will be a labor of love.
Not sure why you are asking in an RV forum, but that’s my opinion...??