There are a few vids from the 80's and even one or maybe 2 from the early 90's but if ya wanna learn how to play like the Rev the first thing ya gotta do is stay greasy, feel the notes just as much as ya hear them and don't rush things like runs and bends...a long slow bend is a powerful thang. Next, remember the greats and by greats I mean Wolf, Muddy and Bo just as much as I mean Hendrix and Beck...Billy looked up to all those guys and learned from them all. Next, and maybe most important...Boogie! If ya know what I mean then you're good to go if ya don't, figure it out quick!
Now, like my man Billy G would say, grab that slab, plug that sucker in, and grind me a pound. Make yo'se'f happy".