I'd try lamb hearts in a second. It's muscle, so it's meat. Just like I look forward to trying cow tongue (muscle/meat) at some point. I just haven't come across it yet.
I do like braunschweiger/liverwurst (which is pork/beef liver), but last time I tried chicken liver (baked, no seasoning), I didn't like it. It sort of tasted like burnt condensed chicken grease... the bad flavor type.
Shanks - what does chicken livers taste like to you? How do you prepare them for the chilli -- anything one needs to keep in mind to about cooking chicken livers?
Ferret - What does lamb heart meat taste like?
Anyone know what cow tongue tastes like?
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