SPRINGS on 65 barracuda

60's thru 70's Mopars don't have coil springs. They have torsion bars. You can easily adjust the front height with the adjuster bolts, but to increase the spring stiffness you need to install thicker torsion bars. The thinnest ones (slant six cars w/o AC, ~0.84"D I recall) are almost freebies, since most people want thicker ones, the exception being drag racers who prefer the thinnest ones. Changing torsion bars is much easier and safer than the coil springs used on GM & Ford cars.

Some people ask a lot for the thick bars, but I got a set for $10 at a local Mopar show that were the 2nd thickest "340 bars" (~0.88" D?), and the seller had many pairs. Thickest factory ones were for big-block Darts, but very rare. After-market sellers make them even >1"D, but those are probably teeth-shatteringly stiff.

Poke around and you will find much info on torsion bars and tables of info. You need A-body only, others won't fit. What you need depends on the front end weight, including AC compressor. If you lighten the engine w/ aluminum (intake, heads, water pump, radiator, Sanyo compressor), the torsion bars can be less stiff for the same handling.

Before you change torsion bars, make sure your problems aren't due to worn shocks. Give the front end the "bump test". It should stop bouncing on the first rebound. There are also spring-assisted shocks, but I have only seen for the rear type (eye hole on both ends).