Not to be a jerk, but regarding the AC plugs, not my 1st choice. (AC Delco is a GM brand, it seems a shame to mix n match brand names, but to each their own) In EVERY vehicle I own, including small engines like lawn mowers, weed whackers, etc., I ONLY use NGK Iridium tipped spark plugs. When available, or else platinum tipped. There's a reason why new car manufacturers use them, they last an incredibly long time, you can go up to 100k miles before they need replacing. The needle tips shoot a really bright blue spark that burns off carbon and they are almost impossible to foul out, providing the rings and valve seals are decent.
I'm a handyman by trade, machanicing is just one of the hats I wear. I have a client with a 35 Ford pickup with a flathead motor, rings are shot to hell and he doesn't want to pull it to rebuild it because I manage to keep it running. Anyways, I swapped out the plugs with Iridiums, along with a 12v conversion, electronic distributor and rewiring the entire truck bumper to bumper (no more cloth covered wires, yay!). Even greasy, they fire up and run. Idles okay, very little smoke anymore (since I changed out the oil with 20w50, a quart of Lucas, and something called Tribotec, an oil additive that's supposed to help fill in scratches and gouges in the rings & cylinders - which helped out a lot!) Although it still does start blowing blue grey smoke once it gets above 2k, and the plugs do get greasy black, the tips are always clean, and it'll fire up cold nearly every time with just a touch of the choke. Even though it'll burn thru a quart of oil in 20 miles, it still starts and runs.
My point is, those Iridium tipped spark plugs work even in poor conditions. I swear by them. Next time you do a tune up, or are having difficulties, it wouldn't hurt to try them out. Iridiums are the shizit, man. Get 'em in your ride.
Another thing I wanted to say regarding points: Setting the gap on install is just a starting point, it'll get you close. To tune it right, you need a dwell meter, not a common selection item anymore with new multimeters, what with almost every modern motor factory equipped with electronic CDI ignitions. I don't remember the exact dwell angle, not a common procedure I perform on a regular basis, but that's why Google is my friend. But I still have my 40+ yr old Sears Penske dwell meter that continues to do the job lurking in the back drawer of my Dave-Cave tool shack. If you're gonna keep running points, I suggest you get one. If the dwell is wrong, it can make a motor pop back thru the carb.
Just my two cents. Take it for what you will. Glad to hear it's running decent again.
