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A new timing chain kit will come with new guides, which you will want to replace when you do the chain. Also at minimum you'll want a new front main seal. A lot of people change the oil pump while they are in there, but the pumps don't usually go bad. The puffing has me a little worried though, that usually means you are loosing compression past the rings. Can you do a compression test on it?
Just recently we had a thread or 2 about timing chain replacement. Take a look for those and read up. It's a good weekend job.
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