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cel,
Sounds more like something changed since the last time you drove it. Bad gas? Stuck float? A bit of dust in a carb passage? Lots of small things to check...
To your question, hydraulic roller lifters can last practically forever - hundreds of thousands of miles in factory installations. Mine are well past 40K miles and are doing fine in a 460-based engine.
If you have a carb, I'd make sure it was OK first. Then maybe the ignition?
Tom
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Wells's law of engine size: If it matters what gear you're in, the engine's too small!
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