I was thinking of a 7' box blade, but figured that might be to much for the 3000 Ford. The cost is not much different from 6.5' to a 7.0'. I have been told to look for a Heavy Duty box blade, with the thicker metal, extra supports on corners, & equipped with a blade inside & on the back side for pushing.
A friend let's me use his when I need it. He is always re-welding it & bending something on it. He is pretty rough on his tractors & equipment. He said I should make sure the box blade has the double plate for the lift arms. He says the standard pins bend & twist to easy.
I really like Case Nutty 1660 photo, guess the wheels keep everything level.