Torsion Bar Replacement

Grasshopper,
What is your "ultimate" goal for the car? You going to leave it as a /6 fun driver? Or are you going to eventually take it up a notch or two? Does it have a front sway bar now?
If you plan to leave it as a /6 and just have fun driving it, I say leave it alone. Upgrade with a sway bar if it doesn't have one now. If future plans are for upgrades, you can always upgrade then, or replace the bars now and be done with that part of it.
You will find that they aren't that difficult to replace. If you change engines you will probably need an alignment at that point again anyhow.
I definitely agree with what mvh said in his post regarding beefing up the front and not the rear.
C