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.