Thanks! Yes, it's a blast to drive. My dad built it for vintage racing, but never ended up doing it. He had built the Healey to be my car right after I was born, was gonna put a more stock engine and running gear in it before he gave it to me but I ended up with it in full vintage race trim. Put it back on the road as soon as I got my license, drove it all through high school and most of college. Put tens of thousands of miles on it as a daily. Made plenty of 8+ hour trips to SoCal and back in it. I mostly just did autoX's at Healey meets. I drove it all the way to Silver Star British Columbia for a meet once, about 1,100 miles one way. AutoX'd it there, then drove it back.
I ran 1.12" torsion bars in my Challenger for 70k+ street miles with 275/40/17's on all 4 corners. NO subframe connectors, NO torque boxes, NO cage. No chassis reinforcements of any kind. In fact, that car had significant structural issues -it had holes in the floor boards, rust in the frame rails, rust in the hard top structure, well, you name it, that car has rust in it. A Utah car that went to Florida before I got it, so rust from the bottom up and the top down. A flexy flyer for sure, but, it never let me down and it certainly never folded up despite the rust damage. It wasn't ideal by any means and I don't recommend it, but, it never failed.
So no, large torsion bars and large sticky tires are not going to destroy the unibody. Is it better to do some chassis reinforcements? Absolutely. But suggesting these cars can't handle wheel rates higher than factory BB bars is just asinine. Clearly shows your lack of experience with that kind of set up.
How about you just admit you've never run an A-body with 1"+ torsion bars and front and rear aftermarket sway bars and leave it at that? You've got no clue how a Mopar equipped like that will perform or hold up, because you haven't done it.