Thanks for the replies. The Last Tune Up was in May. New Plugs, Wires and new internals in the HEI.

I did not run Ethanol on purpose. I stopped at a Shell Station because I needed gas right then.
Many stations are using Ethanol now. I bet they are getting a Tax Refund for it.

I usually run 92 Octane in all my vehicles. Will let you know in a few days how the engine is doing.

250 Integrated Head / 1981 C-10 Pick up.