Big River. I see mentioned above that someone was working on the F#7 to B7 transition. I'm not sure how well known this is, but Johnny also played another chord in this song that doesn't normally appear in tabs online. It's at the end of each verse.

When that e string 3-3-3-0 riff at the end of each verse is played, (and when that phrase is played in the solo) he plays an interesting G / E like chord, where he puts his ring finger on the third fret of the E and plays this E/G chord. (E with a G bass, to coincide with the note of the riff).

I hope I'm describing it right.

I've been a huge fan of Johnny's for years. He has been a tremendous influence on my music.