Upgrade to Disc, or do Alterktion???

I have a 70 Dart with power disk brakes kyb shocks and the big torsion bars . Handles and stops pretty well . Of course I drive like a sane person , no racing . But does drop anchor from 100 mph plus no problem . The stock disk set up from 70 up seems enough , unless you want show or race quality . Saw a rear disk kit for around $815.00 , reasonable . looked like an east upgrade install .
By the way the modified suspension on the other cars in this thread are awesome ! If money were no object I might be tempted .

One thing is I am looking into tightening up the steering , works fine but want more road feedback

And back in the 70's with good shocks springs tires and sway bars my 340 was a canyon blaster , took it on many wild back road blasts .