Aluminum vs cast iron cylinder head suspension effects

I went from iron heads and water pump,slant six torsion bars,and worn out front shocks to alum heads and water pump housing,bilstein shocks and 1.03 torsion bars. Ride is so much better. Tighter and far less body roll in turns. With a front sway bar it would likely be perfect.Now I just need to figure out which leaf springs for the rear.
All this on a big block in a 72 Duster.