What brand of spark plugs have you had luck with

Well, it is cold outside.

I didn't ask to argue but just to see what everyone else is using.

I am going to try some NGKs next.

1972 slant six with a million miles, original engine to my 72 demon.

For some odd reason the engine doesn't like champion anymore.

I tried the Auto LITES and the spark actually seems stronger and runs better.

One size does not fit all but its interesting to pick up bits and pieces from others. imo
correct. I think Autolites are a great plug. NGK as well.