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Same as a flat tappet chevy 350, Ford 351, Olds 455, a 440 doesn't take "special" oil. Assuming 1st engine you've changed oil on?
I like Rotella 10/30 T6 full synthetic in mine. Everyone has their preference.
You say "closest to OE", prior you said you want to put "what came on back", so are you restoring it or not. And spindles don't have calipers, 4 piston or otherwise.
My '67 Coronet 440 4dr is rarer than many Chargers etc.. due to all the 4drs being crushed n Chargers saved. But still no value as not many people like the more-doors.
Take that one off if it's original and buy a new one, then gut the back of it and replace the resistor w a 10ga wire. Fill the back with silicone then install it. Now, that area will look stock but still get full 12+ volts. And you still have original if you ever wanna go back.
Close ratio transmission gearing has absolutely "Nothing" to do with final drive, which unless it's an o/d, is 1:1.
Just use this.
https://www.reillymotorsports.com/speed-tire-rpm-calculator.html