I fitted a Borgeson box to my 72 about 2 years ago. Tighter steering ratio & better feel over original, can't compare to firm feel as I have no experience of their products.
If you do go that way, make sure you spring a little extra for the custom Bergman steering coupler, so you don't have to cut/modify your original steering shaft, makes the whole fit-up pretty painless.
Works especially well on yellow 72 cuda's.