May,
These motors are basically bulletproof, will run on fruit punch if you needed to. I know many people who have run many different kinds of plugs on this motor. I also know someone who was running motorcraft plugs in it. Basically anything will work, but I recommend sticking the to tried and true ACdelco - slightly more money in some situations but theres a reason why chevy uses them from the factory. I have mine sitting in my garage in a box that i need to get to soon. Doing Delcos with MSD wires. One day...