Checked with Classic Performance Products and the Chevell Rack & Pinion has 6" side to throw and tech believed it was based on the Cavalier R&P.
Fatman also has a bracket kit that works with a Cavalier R&P and is set up for a '37 Buick and costs $225 (plus cost opf r&p). They're sending me instructions so I can see what the brackets look like.
Still same issue that 6" throw will increase my turn radius.
The other option that is out there is the Retrorack from Australia.
Has center take off and a side to side throw of over 8", but at a cost of over $3K it is not in my budget.
Without any examples that my 3) below has been done I'm leaning towards either:
1) Welding on a part similar to the bump steer mustang kit that will shorten the steer arm and using a Cavalier R&P, or
2) Use GM gearbox with modified center link.
I know this is a matter of opinion, but can the GM gearbox be set up to steer as well as a the rack & pinion?