If the torsion bars dropped the front end of the car too low, then either they needed to be adjusted or they needed to be a larger diameter.
The only way the above statement wouldn't be true is if the torsion bar material has such a low yield strength that the bars yielded.
Strength or quality of steel does not affect its spring rate.
On front end parts I'd say you get what you pay for. I buy MOOG from Rockauto, find discount code at
www.retailmenot.comOther parts that may be superior quality-wise are AC Delco Professional parts.
I have found suspension parts for my street cars to be inexpensive and I wouldn't want to install the cheaper stuff made today (or yesterday, for that matter.)
Most dirt track racers seem to be using Mopar style ball joints. I bet you could get some pretty bulletproof ones by digging around in catalogs aimed for the circle track crowd.
R