Hi @CeleryVictor -
I grew up on the east coast and spent one or two summer vacays here. So, I probably only had 1970's JITB once or twice. I remember thinking ordering from a talking jack-in-the-box was really cool. When we moved here they were already changing to what they are now. I remember my Cali cousins saying they had to change because of how gross the restaurants had become, making folks sick, health department issues and wasn't there some horse meat controversy. They talked about it in a spooky urban legend kind of way .
Most of my experiences with the tacos started in the 80's, but think I remember a little orange grease as well. Anyway, funny enough, I'm not a vegetarian, but I kinda' got grossed out by them when I found out they had meat in them. They suddenly just tasted wrong . I mean, what meat product tastes like that?
Maybe I'll have a JITB taco soon... maybe.