coil overs

Here's a thought... Go to a parts yard and find a 88 Accord or just about any modern car and have a good look at the structure around their upper strut mount.
To do something similar to an A-body would take strong fab skills but hey.. deleting the upper arm, upper ball joint, etc.. could happen.
In fact, if my memory serves correct, it was done to a second gen' B'cuda using Nissan parts, most everything from the firewall forward was Nissan except the body.
I don't think you want front wheel drive like that build had so keep in mind the caster angles are a lot different. Nearly opposite actually, so where a front wheel drive has the upper strut mount near its firewall, rear wheel drive would be much further forward.

First things first, He's not talking about going to a Macpherson strut system. He was considering eliminating the torsion bars and putting in a coil over shock instead and retaining the upper control arms like in the link I posted earlier.

Second, FWD vs. RWD doesn't influence the caster arrangement as much so as whether the vehicle has manual or power steering. Power steering cars would normally have positive caster (top ball joint/strut tilted towards the driver) where a Manual steering car will normally have negative caster (top ball joint/strut tilted away from driver). With positive caster the turning effort of the steering wheel is increased, but who cares because of the power steering. With negative caster the steering effort is reduced.

Just trying to clear the air here.