Which plugs should I use?

.035 with 12-14psi? No way. Go .028. I had a P600B making 12-13psi and that's what I gapped my plugs at. I used Motorcrafts 2 steps colder than stock and I used NGK TR6's. Car ran good with both sets of plugs.

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Are you using any type of msd ignition with that. I have tried several different types of plugs with this setup. I am still getting spark blowout. I have tried motocraft, Autolites, now I am on a set of AC DELCO plugs that seen to be working the best so far but when I give it full throttle all at once it still does it. Any suggestions. Gap on the plugs is set at .26-.28. I think I am going to have to switch to an MSD setup.

Ok. So I have tried just about everything I can think of. I have tried delco pugs, autolites, bosch, still have the same problem. The delcos do it the least amount so that is what I have in the car right now. I ordered my MSD 6al ignition box today. Hopefully it will be in by friday so I can install it and drive the car. I am hoping this will solve my problem with it cutting out in higher boos. I think it is just blowing the spark out still. The stock ignition is just not cutting it. Any ideas from you guys...or gals. I would like to get the car running good before I waste money to go up and get the tune finished. I had it up there once and luckily the guy was nice and only charged me for half the tune. He got it tuned to where it would idle great which it never did before. I also got it tuned to around 4200 rpms. Puttin down 450 hp with fuel runnin out and stock ignition. Now it has two 255lph pumps and msd ignition. I am hoping to break 600hp at the wheels