K member question

I'll try and answer without being sarcastic Lol. No, I've never studied a 340 K member but this topic has been discussed ad naseam over the last twenty years. I've never seen any physical proof. Just guys saying my uncle told me they had extra gussets welded in, or my cousin had a 340 Hemi and his was made of titanium.

I am a sponge. Educate me but be prepared to show me. I'm from Missouri after all.