Sway Bars

I have a 74' dart that did not come with sway bars from the factory and I building it kind of "custom" since it was originally a /6 car. When I say custom, I mean not putting it back to original. Gonna have a demon stripe etc. My own build kinda. Making my version of a 1974 "Demon" if there was such a thing. Any how, how hard are the aftermarket sway bars to put in? Are they worth it? Any suggestions on which ones are better or easier? All input would be helpful.

DD