Yeah i think the 1984 Ferrari V6 Turbo sound will work well for this. its basically same engine from 1981 to 1986 albeit they did change turbocharger location in 1985. but otherwise the same. Ie cut revs down a bit depending does it rev less and it would work well.
Thanks for the link to the video. The race footage is clearly the 126CK at Monaco in 1981 but some of the test footage at Fiorano appears to be a test mule with some features of both the CK and the forthcoming C2. There are some interesting shots of the body shell being shaped and sanded with seem to be moving toward the C2 shape. I wonder if the video was made between the 81 and 82 seasons using race footage from 1981 and test footage after the season and was released in 1982.