#7 is a Model T so I went to my Ford expert. He says it's a 1924 model because the 1925 had 21 inch tires instead of the 30 inch tires on this car, and the 1923 model had suicide doors. I won't argue.
#8 may be a Willys Knight - not sure.
No clue on #6. Curved dash but not an Olds.