The firing order for a 1978 Ford 460 is: 1-5-4-2-6-3-7-8
the order is : 15426378
If you look on the intake manifold of any engine you will find the firing order.
I must assume you are asking about a 460 Ford V8, as you did not list make and model. Firing order of a 460 (7.5L) Ford is 1-5-4-2-6-3-7-8
Ford did not produce a 460 in 1979. In 1978 the firing order for a 460 is 1-5-4-6-6-3-7-8. Ref: Chilton's Motor Manual 1981
the firing order for the 460 is 15426378
the firing order is : 1-5-4-2-6-3-7-8
the firing order for your 90 f-350 with a 460 should be 15426378 this info is out of a haynes repair manual for 80-96 ford pick ups. It should also be stamped somewhere on your intake manifold.
All of them!
The firing order for an E350 Ford van with a 460 big block is 1, 5, 4, 2, 6, 3, 7, 8. The number one cylinder is on the left as you face the van, on the end of the engine closest to the grill.