I'vw had many issues with the distrubutor on my 2007 GMC 4.3L, Delco dist. So I went to Auto Zone and bought a 5 year distrubutor. Well it went bad just like the OEM delco. Took it back and they replaced it free.
Someone on YT suggested I put a coat of grease on distrubutor to keep the crap and moisture out. So far it's worked. I'm lucky to get 20-30k out of my distributors. That's why I gave up on delco's. Had the same problem with my 95 GMC. Every time I had distrubutor failure, it was extremely humid, raining, or condensation due to a rapid temp change.
As for rust, I took my 2007 GMC to Z-tech the day I bought it. Z-tech for under coat, sprayed bed liner and a wax job. Best money spent. No signs of rust. They put a lot of salt on roads in winter too.
I somewhat wished I had gotten the V8 engine. It has a distributor-less ignition and variable valve timing, I think that's what it's called. Where the v8 can become a 6 cylinder if you don't need the power.
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