This is so cool. I met Ann one time and she told me that the first time they saw Zeppelin live they were offended by the Lemon song but we didn't talk about when they became such an influence. It makes sense that most of the songs she/Heart have covered have been from IV and later.
They had a "chitlin' circuit" in Washington State? My impression was in was here in the South and a few Midwest cities and NY., places that had significant black populations. Hell, I bet most of the folks up in the Pacific Northwest didn't even know what "chitlins" were.