Which should I go for? markviiisvt4 has a set of Autolite 104'* he can give me. Are they a better choice over the NGK'*?

The 104'* are a copper core and run slightly cooler.

I've got a set of NGK TR55 Iridium IX in mine,they're a bit spendy but I haven't had any problems

TR55'* are also available in Copper. Take your pick. My preference are the NGK'*. They make AC Delco plugs.

I may have to change though. It seems NGK may have stopped making the TR7 (3 heat ranges colder) in which case, I'll probably switch to the Autolites. At 15psi or so, I have to go another step from the TR6 (2 heatranges colder) from where I am.

Cool, well they will be going in tomorrow. What'* the recommended gap? Cat'* going on this or next weekend.

For the TR55'* (one heat range colder, which is what you need going from stock to 2.5" on a Gen3 setup), .055" gap is ideal. You can go to .060" (stock gap) with stock 97 or newer L67 coils or MSD 8224 coils.

The Autolights seem to help out with KR more then NGKs but the NGKs will last longer. I dont mind changing my plugs and change them a few times a year so it isn't a problem with me. The Autolights are cheaper then NGKs so it evens out in the end. So if you don't mind changing your plugs I'd go with Autolights, if you just want to install them and forget about them - NGKs. As far as heat range I wouldn't bother with a heat range colder plug unless your N/A. That is what Intense, ZZP, and WBS recommend also.

Autolite 104'* went in tonight and eliminated the popping and bucking. Seems to idle nearly 100% better.