1985 Ford F-150, 5.0L V8, 165,000 Miles

My advice would be to get a repair book, like a Haynes or Chiltons. Why did you change the fuel pump? Were you getting 12 volts to the pump and it wasn't tuning on or did you just replace it. Why did you replace the distributor? Are you sure it was bad. Did you follow proper procedure for changing it. When did you change the firing order. After your wife drove it to the store? The firing order couldn't have been wrong if it ran OK to the store. There's too much that could be wrong here. Buy a repair book and make sure you installed the distributor right, that you have the right firing order. Make sure your getting fuel and spark to the engine and spark at the right time.

Make sure your getting proper fuel pressure. I can't access repair info on my computer right now, it's acting up. But that info should be in your repair book. Does it have 2 fuel pumps. If yes, disconnect the line coming out of the tank, put a pan under it and turn the key and see if fuel pumps out. I'm assuming it's fuel injected. It's hard to check unless you take them out and bring them somewhere that can test them.
I understand why you changed the firing order, but I was just questioning that you said it ran fine going to the store. That should be right to change them to the firing order in the book. Buy a spark gap tester, they're pretty cheap and check for a good strong spark at each cylinder. If not, check the ignition coil. Make sure the distributor rotor is pointing at the #1 position at top dead center on the compression stroke. Check the timing chain according to the book. You might want to check for back pressure. Your catalytic convertor might be plugged up. You can use a back pressure gauge or even disconnect the exhaust system. Hope some of this helps. Post back if you have questions.