champion plugs

I always used Champion plugs years ago until I started bracket racing. I gave them all (the American plugs)the 1/4 mile challenge. The Champions were good for 4-5 runs, A/C you might as well throw away,they weren`t even good for one hard run.(Strange how they do fine in Chevys?) Autolites would go all day, and yielded the best times,and since then, I`ve used Autolite exclusively. I`ve tried the NGK`s and Bosch plugs but my Mopars have always run the best with Autolites. Anyway I believe Champion has discontinued making a lot of their plugs for the old Mopars.They`re getting hard to find.