Translation:Three tall men stand by the black car.
It remains singular whenever a specific number is stated. This is a landmark moment for me; first question ever posed in these forums that i know the answer to. I would suggest that as an adjunct to the course you use hungarianreference.com as a resource for grammatical and related stuff. I have found it to be reliable and understandable.
i have always thought of it as categorical, as three individual examples of the category, or general idea of :"Man." So that would apply for Sok, many examples of the category "man" but not to "we are the men of the army, or they are the men I was telling you about.. Even before having a command of it, Hungarian has already bent my mind in some interesting ways.