It's all about putting the right combination of parts together. Yes, the modern fans, & accessories are better than the old stock parts but there are a bunch of good updated mechanical parts available now. I worked at a performance & restoration shop for decades & have seen many Mismatched...
A while back Motortrend / HotRod had an article;
Mopars Need Extra Help With The Heat—Here’s How To Fix It! What's the part number for the fan clutch in this article? I tried emailing them several times with no response.
How big is the 4 barrel? Stock? Even though I have a big block(440+.30) I use Autolite plugs, I have tried a bunch of other brands, I like the Autolites the best.