I got bosch 4s in my truck and it seems to run ok but a lot of people actually advise against running bosch 4s in a dodge. they soemtimes make the number 8 cylinder misfire and then foul out the plugs rather quickly. A lot of people will use autolites and have great thigns to say about them but I personally don't know. In my opinion based upon what you have said I would suggest getting a different plug like a champion or an autolite but you seemed to have problems with the autolites. from what I have seen on another forum the autolite 3923 plugs gapped at 0.030-0.040 have worked and gotten rid of pinging in an engine. I'll atatche a link that might be helpful with more info about different spark plugs.
http://www.dodgetalk.com/forums/show...plugs+autolite