This is probably true in the HO's in the Mustangs, but I know the truck 302's (5.0) did not go rollers until 91 or 92 when they went to multiport fuel injection.1985 and newer 5.0 HO's were all roller motors (85 was last year of carbs) but I think he's asking about the clutch mechanism. All FOX and SN95 cars had cables. There are nice after market kits that have billet bellcranks and firewall adjustable cables. Typically they'll last for a long time and can handle high rate pressure plates. I would definately prefer that style over a hydraulic setup.
you have to be kinda carefull with that though, because there is no set year.. you could have a 5 speed in 87, and a 4 speed well into the 90's, other than that though, as you sad, 4 speeds have external slave, and 5 speeds internal slaves, unless they were behind a diesel or big block.A 1987 Ford F150 has an external slave cylinder to push on the clutch fork. I have/had one on my 4x4 that had a I6 and a 4sp. The bell housing is also removeable so if you find a 87 in a yard you can buy the bell and get the bracket that holds on the external slave.
in 1988 they went to an internal slave with the 5sp and that didnt have a removable bellhousing because it was made by mazda.