I was out and about the other day working on my cheese report and decided to get some lunch. Had just driven up from Sellwood and so I took a right and went down Powell and remembered Trillium's rec for a taco truck around 33rd and Powell. This is the only one I saw.
Torres de Morelos was closer to 32nd and Powell. It has a semi-permanent spot, it seems, with a covered area to eat.
I don't know if this is the one that Trillium had recommended. Tripas and lengua are on the menu, but I didn't see any buche.
Essentially, they have several basic meats (pollo, asada, lengua, etc) in multiple forms (tacos, quesadillas, burritos, etc).
I got a taco al pastor and a sope de asada, just to try it out. The tortillas for the taco were nicely refreshed, cooked lightly before service in the drippings from the meat. A nice touch. The al pastor, I thought, was a bit bitter. There were pieces of pineapple among the well-cooked meat. But the flavor was off.
The sope was handmade and had a good texture. Really, it reminded me more of huaraches I've seen on the western coast of Mexico. The difference is that it was thinner, like a double-thick tortilla. It had beans, meat, lettuce, cheese, sour cream, and guacamole. It was pretty darn good. The meat was crusty and well-seasoned and all the parts were good as well.