Unless you are painting the dashboard, I suggest pulling the windshield instead to make the dash pad installation easier, especially if the windshield is in need of changing.

Whenever I need to spend an extended period of time under the dash of a PV, I remove the front seats by sliding them forward off the tracks, no tools required. Then using a creeper as a back board, I lie down and work under the dash. I use a stack of old folded fender covers to level the creeper and some as a pillow and cover for the pedals. A small magnetic base light helps a lot too.

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Eric
Hi Performance Automotive Service (formerly OVO or Old Volvos Only)
Torrance, CA 90502
hiperformanceautoservice.com or oldvolvosonly.com