Not knowledgeable about B20 Cams, yet resources exist to track down a specific cam grind / profile. Such as here: (copy and paste URL to new window / tab):

http://www.1800philes.com/ianr/_superlist_grinds.html

Else, you may want to ask at the Turbobricks site:
http://forums.turbobricks.com/

In the Turbobricks site article OEM AND AFTERMARKET CAM SPECIFICATIONS
Data compiled by Fredrik Persson

See the entry B18/B20 8v cams, rocker ratio 1.45 (TG Motor 1.5), third set of cam spec data:

https://turbobricks.com/resources.php?content=camspec

Observe discussion about valve springs and rocker arm length with high lift cams in B18/B20.

You will want to get a password account at the Turbobricks site so you can access the innumerable build threads with value-saving guidance on getting the best HP for your dollar!

Volvo Turbo World may have some useful info, yet appears mostly for OHC redblocks:

http://people.physics.anu.edu.au/~amh110/turbo_world.htm

Also, check the classified and auction ads:
eBay
Amazon
iPd classifieds
Turbobricks classifieds
Brickboard class ads

Other articles from other forums after a quick web search:

https://www.swedespeed.com/threads/b20-engine-build-cam-spec-thoughts.198727/

https://ozvolvo.org/discussion/4308/b18-b20-camshaft-experiences-and-options

One of many vendors. They grind from blanks?
http://schneidercams.com/volvob18b204cyl.aspx

KG Trimming is in Sweden:
https://www.kgtrimning.org/tuning-special/b18b20b30/camshafts/

Old Brickboard thread on this topic:
https://www.brickboard.com/RWD/index.htm?id=1346728&show_all=1

B20 block and head choice for performance build 120-130
https://www.brickboard.com/RWD/index.htm?id=1261897&show_all=1

Maybe information here at this Australian Site:
https://ozvolvo.org/

Hope that helps you.
--
Beh.