When it comes to oil they are all the same just different plastic jugs.
When it come to distributor caps buying any after market you take a small risk of buying one with an imperfection or hair line crack that will cause a car miss.
DISTRIBUTOR CAP & ROTOR;What ever car you are working on the manufactures parts are always best but real spendy. In your case Ford Genuine Parts are always nice but spendy, depending on your path you chose either a Ford dealer($$) OR any NAPA will suffice for the cap and rotor.
PLUGS; Are a different ball of wax! If you don't intend to change the plugs every 3000- 7000 miles I would highly suggest a Platnuim Plug. If your going to change frequently all the brand name are fine,
(you can't get horse power out of a plug only the longevity of it!)
But if you want to not have to fool with again for awhile, (especially if a few of them are a B_ _ _ _ H to get too) then spend the $10.00 a plug for the Platnuim.
The next issue I must say is the wires.
If for example if they APPEAR nice, that can be an illusion. If they are original from 83 toss them. Or if they have been sitting on the exhuast manifold for a long time then the arc from the ignition spark will ruin them and you'll lose horse power. Also if they are the thinner wires NON silicone and the wires are touching each other the same calamity can happen, loss of power and bad, brittle wires.
One really easy way to find out is go to an EXTREME DARK PLACE, NO MOON LIGHT, NO STREET LIGHTS FOR MILES, and open your hood, have someone step on the gas as you watch inside. If you have bad miss firing you can't miss the blue light where your losing ignition spark grounding out somewhere from the spark plug wires.
So time needs to spent on installing new wires PROPERLY. If you want I can easily walk you through it when your ready.
