Highly subject to opinion, but I'm running a generic glass pack, and adore it. Are you looking for quiet, loud-but-mellow, or...just not ricey? What does the muffler you're running look like? Is it stainless (from my decades of experience, most 'fart cans' are usually shiny stainless with obnoxiously large tips. lol)?
Can you link us a YouTube vid or a sound clip, that would narrow it down and give us something better from which to base opinions.

Also, seeing you're ref'ing a '73, are you 1.6 or 2.0 powered? That will probably make a diff in opinion, as well.
