Mostly stock 340 engine what Spark plugs

Mo-Par said
Autolite 65s ,I have never run anything more reliable ever.

I put autolite's in my 85 318 and they didn't last 3 months. They were possibly defective, but I'll never know for sure. That's when someone suggested the NGK's and they were in the truck 8mo and were still good when I sold it