'82 Caprice Engine won't start

I have an '82 4.4L Caprice engine in my pickup which won't start. The starter cranks well, I'm fairly certain the engine's getting gas, I've checked all the fuses, the battery's been tested and it's good, but I can't get it to turn over at all, much less start. It has sat for a few months. My best assessment for far is that it's not getting spark, but that could be wrong or if it's correct I don't know why.