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It might end up more like Buckboard bacon. I believe there is more fat throughout the sirloin roast, been a while since I've cooked one. I'd brine it in Pop's brine and go for it!
That is the end of the Loin closest to the Tail. If it is Boneless you are on easy street, not as pretty as Center Cut CB but will taste great. If there is a Bone, Cure and Smoke it any way. Boning it out is a bit of work and you will get some small pieces but again will be good eats. Save the Bones for Bean or Pea Soup...JJ