Anybody using Driven brand HR-2 oil in their slant?

Glad to help out. Oh:

My expectation is that this amazing (and now professionally rebuilt to zero time specifications) piece of engineering that the Chrysler Corporation created in the late fifties will run perfectly for the next 150,000 miles as long as I change the oil and filter every 3000 miles.

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That would have been an appropriate change interval for a preservation-minded driver using yesterday's sludgy oils and less-capable filters in an engine running on yesterday's dirty gasolines. Today, it's a needless waste of money and oil with no benefit to you, your car, or anyone else except the cash intake of NAPA and whoever makes their oil.

6,000 miles is much more realistic today, or maybe even more. If you're reluctant to let go of the propaganda (if you really care about your car, blah-blah-blah…) just on principle, have your oil analyzed at 3,000 miles; you'll get a detailed report on the condition of your engine and the oil in it, and you can decide whether and when to change (or run the next analysis) based on hard data applicable to your car.