It all seems kosher then. Well apart from the bodgey Dimarzio pick up and the flakey pot/s.
The tone pots measure at ~350kΩ and the volume at ~420kΩ in circuit, so given the age and the fact they are in circuit then 300 and 500 would be about right.
While measuring them (and trying to establish if they were linear or log) they all exhibited drop outs, so I might bite the bullet and replace all four.
For the record they appear to be log pots (tapered or AT).