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Try the search feature,not trying to be smart here but there is tons of great info.The Bendex unit is a straight replacement so you can keep your column the way it is.You will need the pump,brackets,pulleys and hoses from the donor vehicle.The bnedex is not a great unit and is prone to leaking and overheating.
The Ford(Saginaw) system is physically larger and some modifications to the steering column will be needed.The Ford unit is much easier to come by and more reliable.There is much more info in the search section.Good luck!!
Joe
It's been on here before, but do yourself a BIG favor and get components from ONE truck- that way you know everything is compatible. And if you get brackets and pulleys off another engine, use ALL of them. I went nuts buying pulleys and brackets before it occured to me that Ford apparently changed them every year, esp. in the mid 70's. Go ahead and rebuild and paint all the components before installing them. These are big, heavy parts; you won't want to do it twice. The 73-79 front ends are disc brakes, so find a donor and kill all the birds w/ one stone. If you have access to a donor truck, start spraying those components w/ rust buster well in advance of actually trying to unbolt them.