I would keep it stock. I see NAPA has 2 regulators, one for $60 and one for $35. I did modify my stock wiring harness to accept a GM alternator with a internal regulator, not a big deal but then you need to decide what to do with the fuel pump wiring like the above reply has mentioned. Again, if the truck is stock I would buy the replacement regulator, since my truck is modified from the front to back I went with the bigger amp GM alternator and did a separate circuit for the fuel pump.
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