This is the last time I have to justify my decisions. If you spend your time in new movies you'll see the matter goes better.
Last time: backgrounds must improve the page and not make it worse.
24 is fuzzy, your 29 is obstructing the truck and not the previous one; and 37 and 39 are some blurred ....PLEASE we are speaking of simples background cars and usual cars of the 60s.
Don't waste your time adding pics like http://forum.imcdb.org/forum_topic-4910-car_wash_1976_redux.html

Do you think 97 backgrounds improve a page already listed with 28 pics?
i.e. A good background is your Triumph (38) but what are 34-37 littles and fuzzy cars seen through the window of a bar; or 43-68 littles, far, part seen of background cars.
If you like background cars it's perfect but like your Triumph, not like the rest.