Help me find this comedy routine from the 70s

Cafe Society
1

I think it might be Cheech and Chong. Two stoners are talking and one says that he played [some song by some band, maybe some Led Zeppelin song?] backwards and saw God. The other one says, “Oh yeah, man, I did that with Grand Funk Railroad.” Part of a longer bit.

2

Let’s Make A Dope Deal.

3

That’s the one! Thanks!

4

“Our judges say: that’s okay! They roll big joints too!”