spark plugs 85 K20?

[tigwelder]

tuning my 85 K20 . what are the best spark plugs to use  ? it has a 350 with auto. came with factory dual exhaust and stainless exhaust manifolds . was told when I got it that it had 2 air pumps when new but are long gone. i have been driving truck for 3 years runs good .time for tune up before the snow hits.

[454Man]

AC delco here... 6- 44ts and (2- 45ts in the valve leak cylinders). Couldn't get any better. :-)

What's under the hood??? If you have to ask maybe we shouldn't race...