If you can't get your engine to start running, a spark plug issue could be the culprit. Faulty or malfunctioning spark plugs can prevent your engine from doing its job correctly (or at all), so ...

I ASSUME it's a three-valve V8, and if so it is a common problem. I know one case where the heads had to be removed from the engine so the bits of plug jammed in the threads could be removed safely.