Yeah...replace the plug wires while you're at it. But do them one at a time. Long ago and in a galaxy far, far away, I decided to do a tune-up on my Datsun 510. Of course in those days, I didn't start any project until I'd carefully considered and planned the course of action...usually over a six-pack (or more) of "barley pop." By the time I got started, I was just a little bit fuzzy around the edges...and I just took things apart until I had all the stuff that I was gonna remove lying in a heap on the ground.
First I gapped the plugs. I used a paper match since I couldn't find my feeler gauges...and I used the matchbook cover to set the gap on the dual points. Then I started putting stuff back together and darned if I didn't have a clue on the firing order. It was only a 1600 cc OHC 4-banger, but since my buddy and I had demolished a couple more six-packs, rational thinking was in short supply. I tried every combination that I could think of in my slightly inebriated state and eventually ran the battery down to nuttin crankin it over tryin to start it. No luck at all.
Eventually I had to do the most ego-damaging thing that a shadetree mechanic can do: I had it towed to the local Datsun dealer and plead not guilty by reason of insanity. The mechanic wired it up and set the point gap and timing in about 15 minutes. Turns out that I didn't bother to see which way the distributor was turning. Every combination of plug wire location had been based on the distributor turning the way I thought it would (I can't remember, but I think the Datsun distributor turned counter-clockwise) and as a result, I made a big mess of things, since I'd been trying to make sense of things based on the distributor turning in the opposite direction. If I'd just taken the cap off and watched the rotor turn while my buddy cranked the motor over, it might bave had a little different outcome.
It only took me another 20 years before I figured out that I wasn't very good at drinking and working on cars...or doing much of anything, for that matter. To make a long story short, I had my last drink on 12/31/91.
But back to the suggestions. If this is your first time doing a tune-up, I'd do it in steps: Gap all the plugs (they may be pre-gapped...if so, skip this step) then replace them one at a time and put the plug wire back on. Then fire it up, just to make sure that ya didn't miss anything.
There are several ways that you could replace the wires and cap, so do it in a way that you don't do like I did and lose track of what goes where.
Make sure you get some lube on the points rubbing block...or better yet (in my opinion) install a Pertronix Igniter module in and forget about points forever.
That otta give you a coupla ideas on how NOT to make the same mistakes I did that day.
