Around eighty to ninety percent of the sound you hear on that song can be attributed to the "low-fidelity" of how it was recorded. I too, am a huge, huge fan of the liquidy goodness of this song--I have covered it countless times--and you can get very close with a Les Paul or PRS, a germanium or very warm silicon fuzz, a boost, and a nice warm amplifier. The main way I emulate that tone is dialing in my amplifier, fuzz, and overdrive boost at all the right levels. I play through a heavily cusomized Orange AD-30R, so I have the warm amp point down. Next, consider that fuzz at high distortion levels will sound very blatty, so it needs to be just right. It took me a couple of days or so to get the fuzz + overdrive mix down so that it sounds acceptable. For the quiet portions of the song I play with the amp just at breakup, fuzz engaged, but the volume knob rolled back so the fuzz isn't too heavy. For the interlude sections, dial the volume up a bit to get some more cream. Then, and this is the fun part, during the lead section I dime my volume, engage my boost, and send my amplifier into a warm, fuzzy, yet creamy pissed off rage as I completely massacre (and not in a good way) the solo.