Increasing the ride height is some of the easiest tasks on a G body 911 from our host:
https://www.pelicanparts.com/techarticles/101_Projects_Porsche_911/55-Lowering_the_911/55-Lowering_the_911.htm
I couldn't find a single video showing only that task. But there are plenty of videos talking lowering and making over the adjustment of the riding gear on a 911. Instead of lowering you increase the ride height by turning the screws the other way...pretty that simple.
Brief intro:
https://youtu.be/8VXnBxrqriE?t=154
Playlist from KlassikATS about 911 suspension:
https://www.youtube.com/playlist?list=PLkWFofpgz2Og6nqijrJAFz7MB_vVCU9Vp
Very good explanation of a proper suspension adjustment:
https://www.youtube.com/watch?v=sflOzTfxOQA (pt2, pt1 also available in the channel)
Always give the car a full wheel alignment afterwards incl. weight distribution on all 4 corners which is key on these cars. Probably it makes sense to do other jobs on the ride gear as well before...
Here in the tech spec book from Porsche you get all the required numbers:
https://porschecarshistory.com/wp-content/old/Techspec/03/911-all-78-81.pdf
From 1981-1983 pretty much nothing big changed any more.
It seems that you're new to these cars. There's a bunch of reading I always warmly recommend to get a better technical understanding of these cars because they're a bit special than other cars:
https://www.amazon.com/-/en/dp/1845849558
https://www.amazon.com/Porsche-Service-Manual-1978-1979/dp/0837617057
https://www.amazon.com/-/en/dp/0760308535/ (online
https://www.pelicanparts.com/cat/r_911m)
There are many more but these are precious to every 911 newbie ...
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How much height can one get from turning the adjustment screw?
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On the front much more than on the rear, if your car already has the adjustable rear sway arms which I suppose should be the case on a SC ...it's probably enough to solve your issue.
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More importantly how does one adjust height with the torsion bars?
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Torsion bars can be remained when adjusting the height.
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Does the whole TB need to come out and be reindexed or can you reindex just the cap?
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Only on the rear and depending on the height you want to achieve. See above.
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How can one tell with the car on the lift if your indexing the right way "higher" rather than lower with the suspension at full droop?
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There are angle numbers given in the tech spec book, mainly the setting is primarily adjusted on counting teeth of the spring bars & control arms and fine-tuning then standing on the ground.
Thomas