Being you could get either as shown in the pictures, that is the hook up for the top link. You can get the slide in tong type 3 pt. arms, or a regular 3 point conversion that has a bail across the top with it's own top link. Or, find a salvaged 606 with 3 pt., and change it out.
The tong type conversion are much more reasonable in price, but you'll probably need the long top link. I know I had to get one for my Super C. Even with that, seems you don't get the geometry of a true 3 pt. hitch. If it's lifted as high as the FH in the first picture, the tail end of the implement will drop after a certain point of lifting. On the other hand, one of the great things about Fast Hitch is, it has down pressure. That would be pretty handy on a tractor that size if you had a HD blade, and grading.
If you do get it, keep on the look out for FH implements. They usually bring less money, as that's all they fit. There are two category's to the Fast Hitch implements. The smaller one is for Super C's. My 240 has the larger one. There's something like a 1/8" to 3/16 difference in height of the prong. We made spacers to slide in on the bottom of the female part on the tractor out of flat strap, with a turned down tang to keep it from sliding on through. There is a nub sticking down on the prongs, that stops it from going in too far. I can use my Su C's implements on the 240 if I want to.