That picture is wired kinda wierd for a Ford jimmyjames. I would've said any variation from a 302 would've been for the 351, but what you describe is almost, dare I say it, Chevy-like?
The one that 73stallion mentions is the "other" Ford Windsor firing order.
That one is for all 351's and '82 and later H.O. 5.0's.
Yeah, I know, a 5.0 IS a 302, but they changed from the 302 firing order (15426378) to the 351 firing order (13726548) in or around '82 on the H.O.'s to reduce a vibration caused wear pattern on the numbers 7 and 8 rod bearings (or something like that) in the higher performance, higher revving engines. The longer stroke 351 engines were always sensitive to this so they always had the non-302 firing order. It's a cam change and wire location change only. The crankshaft has the same orientation, the valves just open and close at different times so the spark needs to happen at the appropriate time.
It had a side benefit of not being so sensitive to a 7/8 spark crossover when the plug wires got old. Bonus.
So if you have converted to a 5.0 EFI engine, then you use the 351 firing order. The only other reason to use it is if you have installed a cam that uses the late model firing order.
They still sell hot cams in either firing order so you have to know which one you have to set it right. I imagine all roller type cams are the later model firing order, but I don't know that for a fact.
So, if you're running a stock Bronco 302, use the 15426378 order like was mentioned by the others.
Paul
