The Heritage is undoubtedly my nicest guitar - it has been stored away in a closet for 15+ years just so I wouldn't be tempted to screw it up with my nefarious schemes...
I had replaced the crappy Schaller bridge, tailpiece and pickups with Gibson hardware and Lindy Fralin A4 humbuckers around 1999. More on the bridge later...
My wiring plans... First of all a P-P phase switch on the bridge tone pot to get those Peter Green tones. For the two volume controls I will be able to switch from interactive (Gibson) wiring to independent (Gretsch) wiring. I love getting the full range of blends in the middle position with Gretsch wiring but without a master volume the output cannot be not completely muted (very noticeable at high gain settings.). As for the neck tone control I'll probably wire in coil cuts for both pickups. (With the phase switch I can select either of the bridge pickup coils. Whoopie!)
P.S. As for Gibson bridge I installed many years ago it was a Nashville T-O-M but I mounted it like an ABR-1 with studs screwed into the threaded bushings and 2 spinner discs to set the height. One end of the "studs" had a rough edge so I'm sure that I got bolts with the correct thread from the local hardware store and cut them to length. Ouch! I replaced that mess with the $12.xx Mighty Mite factory clearance T-O-M bridges and bushings from StewMac.
P.P.S. The original Schaller pickups had a really cool "Spirit in the Sky" vibe which got *really* old after about 5 minutes.
P.P.P.S. According to Kid Andersen the secret to getting Hubert Sumlin's tone on those great Howlin' Wolf songs from the 60's was to have the two pickups on your Les Paul out of phase while turning down the tone control on the bridge pickup and turning up the tone control of the neck pickup... set the two volume controls to taste (try starting at 5 and 5.)
Watch "Hubert Sumlin Tone Secrets!" on YouTube
from Kid Andersen
#1. Pickups need to be out of phase (Hubert used P90's but humbuckers work, too.)
#2. Set Bridge PU tone to 0
#3. Set Neck PU tone to 10
#4. Turn up gain/volume/treble on amp
#5. Adjust Bridge & Neck pickups to taste (start around 5 & 5)
Note 1: You need a Les Paul style guitar with two volume and two tone controls to do this. It works even better if you rewire volume controls so that they are independent (switch leads going to pickup and to selector switch.)
Note 2: The video mentions that the two pickups need to be magnetically out of phase but just reversing the two leads coming from the pair of bobbins works, too.