If you did that, you'd be right back to the old style set and having about an extra 1" of suspension travel. And then you just add a small bumpstop onto the frame horn, whatever you're comfortable with. I run a 3/8" tall one on mine.
It's pretty tempting. I am trying to absolutely optimize the torsion bar system on my Valiant so gaining an extra 1" of travel is worth the money and effort. I am a believer in the torsion bar system and the Green Brick was a hero car of mine growing up and apparently Tim Werner as well.
I am not against the coilover suspension but I am also for torsion bar systems. I understand and agree with your view that if people did a little research they may choose to build an OEM based system instead of jumping right to a coilover system.
There are many variables that come into play when choosing a front suspension and removing any misunderstanding AND bias is important to honestly arriving at a conclusion that is best for you.
For my Valiant, I just want to achieve what Dick Ehrenberg and Tim Werner achieved and in the same way (as far as front suspension). For my 'cuda I needed clearance for 1-7/8" header primaries, I wanted to be able to tune the suspension faster than changing out torsion bars, and I wanted the lowest ride height I could get. Some say, "Different strokes for different folks" but I say, "Different strokes for different cars".
Know your options and do your due diligence in weighing the options.