The factory V-belt "tensioners" I have seen used on FE engines were of three types.
1) The mechanic physically pulls up the desired tension as they tighten the accessory. (like most alternators)
2) There is a bolt of some type that is turned against a fixed post that moves the accessory thus providing the desired tension. (usually on an emissions air pump, or power steering pump)
3) There is an idle pulley used as the tension device, again mechanically set.
I do not know of an FE engine that was factory equipped with an automatic, spring type, tensioner.
This does not mean you can not install such a device, nor does it mean you will not encounter one on a modified FE powered vehicle.
As long as the tensioner is in alignment, and has the ability to hold the proper tension, I would suspect any type of tensioner would work.