Billy did a lot of catch-as-catch-can training, in his later years, so while they are not interviews, as such, you can find him showing people how to do certain things on Youtube.
I grew up with WOS but got seduced by the steroid fake tan WWF. Interviews with Karl Gotch and Billy enlightenment me to the shooters, I know there were quite a few Yanks that were legit too. Kendo lives not far from me I've been trying to speak to him about the snake pit and shooters in wrestling.
Billy did a lot of catch-as-catch-can training, in his later years, so while they are not interviews, as such, you can find him showing people how to do certain things on Youtube.