All green manuals for each 164 year and other stuff:

http://www.240.se/litteratur/service100.htm

BW35 manual:
https://volvo1800pictures.com/sweden/Volvo_1800_dokumentation_main_page_en.php

I'm not well-practiced at auto boxes the the BW35. You can apply adjustments to brake bands, servos or something to gain efficacy. Yet to enjoy and apply the B30 torque a manual gear box with final drive ratio consideration at the differential will improve economy and performance.

Take care if you like high speed. The 164 is a wing cross section and does gain lift the faster you go. About 130 MPH is the limit. Consider ground effects like an air dam at least and maybe upgrade to ventilated front rotors.

I don't care for facepuke, the way the site discriminates against the Brickboard and Amazon Web Services (AWS).

Yet you may want to ask at the facepuke 164 forum.

You'll need, regrettably, a facepuke account to access:

https://www.facebook.com/groups/Volvo164/
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Beh.