I changed only the pickups, and soldered them directly to the old cables once I cut the horrible epi wax potted pickups off.
Very simple mod. Insulating tape and 4 solder joints.
I installed entwistle nemesys afg instead (the dearest pickup entwistle makes) the result is superb, and it has become much more than the weedy thin tones I had previously from my bb. Epi.) Now I think a phase switch is in order for Peter green tones and even more versatility.
Look at the entwistles. I have very many geetars, and these are head and shoulders above any others (and I've tried very many top name humbuckers and single coils. The best at a quarter of the price.