Getting ready to swap a 5.7 into my 73 Dart Swinger

Huge edit on this post I'm now in a torn position as the coupler to shorten the drive shaft is 125 alone plus the power steering unit plus whatever else may or may not be necessary I'm considering a manual steering box can anyone hear point me in the right direction I was looking at the wrong thing before I believe there was a company PST that made a manual steering box and said drastically increases header space but I'd like to see what everyone says I believe I am going manual at this point