Not Ranked
You can check the plugs and after all they have been through that is probably not a bad idea. But the fact it is still hard to start and doesn't seem to run right would still seem to point to a timing problem. If it will start and doesn't want to keep running, look at your fule feed and carb. The backfires could have messed up the carb. If it is hard to turn over after getting hot, check the starter connections, and you may have to go to a heavier starter, especially if that one is near any headers or getting any heat from the exhausts.
Ron
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