IF a Commodore/Monaro subframe could be persuaded to fit, then that should see most of the steering and suspension issues resolved, as you could use the entire front suspension, all of which can be upgraded quite easily
(Pedders and others do bushing kits that replace all the rubber joints from the front end).
What this arrangement would do to the geometry is anyones guess though
The other problem, is that the steering column exits the bulkhead at a very specific point. Is this compatible with a steering rack? And by doing away with the steering box, would the column foul the exhaust anyway.
I suppose it would be possible to replace the chassis rails, bulkhead and front end of the transmission tunnel with
Holden ones, allowing the entire Holden front end to be used from the steering column forward.
A substantially rear ended Monaro might be the onestopshop for this
The simplest solution is to use as much of the Omega as possible... I need to get those arms fitted and put some miles on them...