1" just suspension torsion bars on sale again. $159

I have them in my 69, it rides like a 1 ton dually, no body roll on corners, but very harsh at slow speed! Probably doesnt help with SS springs in rear though.

SS springs certainly don't help. They are stiffer than most aftermarket handling leafs.

I ran my .99" t-bar with original stock 340 rear leafs (worn).