Thanks for the additional info. I can understand what you want to do now. Because you're driving an alternator, you need to keep the speed high regardless of load. I don't believe you will save that much fuel if you disable two cylinders, but it's worth a try.
The GM variable displacement engines, both the nefarious Cadillac 8-6-4 and the current "displacement on demand" motors, shut down cylinders by disabling the valves. I think that's the easiest route for you, and it's easy to reverse. I'm not familiar with the 400, but I assume it's an overhead valve engine. It should be reasonably easy to remove the lifters and pushrods as suggested by Johnski. You don't need to keep the valves open, though: The dead cylinders will work as big springs so that there is very little net power loss.
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