8 3/4 question

For the Dart, on the street, with stock wheel houses, my opinion is that with any Normally Aspirated engine; what the number on the carrier is, hardly matters and all Mopar Sure-Grips will fit into it, with the appropriate bearings.
Your 489, if it matters, is the strongest.
And, whether you use the Cone-type or the Clutch-type, again, on the street it hardly matters, and I prefer the cone-type for it's smooth and consistent action, and; Contrary to common understanding, the cone-type is rebuildable and adjustable.
I speak from my experience with a 367 cubic inch engine pushing 430 hp, in a 68 Barracuda, with a manual trans, that has the factory tubs, and running up to 325/50-15s.. At one time or another, since 1999, that combo has seen every carrier and clutch combo, and nearly every gear from 2.76 to 4.88, most of them spinning 295s. I have never broke a pinion.