Good question. When I did the upgrade I was under the impression that the pickups were “mini-humbucker” dual coil units.
We now know that this is not the case; that the pickups are in fact single coil units.
That being said, the original pots metered at 422K ohms and I used 500K pots. They work just fine, but if you feel like experimenting . . .
I replaced the jack with a True Tone multi-contact jack because I had things apart and why not? However there is nothing wrong with the original jack.
The only scary part of this upgrade is enlarging the holes for the pots. Use a tapered reamer and work very slowly!