273 is it good engine?

I just learned that they existed are they any good or just not worth messing with them since they made them only for 5 years? Any thoughts 225 vs 273? Thank you
Good motors, as elaborated on above. Not worth messing with since only made for 5 years? Hell, the street Hemi was only made '66-'71. Doesn't make it not worth messing with. :) (Yeah, I know that's a different league...)