I'd just use a make shift snoot or maybe make some diy grids out of drinks straws or cardboard, have the light quite hard to give more shape.
I'd say personally a softbox would be two broad a light and therefore to soft for the size of the cars. But it depends what you want from the image.
Your speedlights will be a better choice than the studio strobes, as you point out, because of the flash duration and should be more than powerful enough at night.
The key here is to use the flash duration to freeze the motion, not the shutter speed. Just use the shutter to affect the amount of ambient that's let in. So dont worry about only syncing at 1/250th, this will probably just cut all the ambient out.
I reckon you could get away with f8 @ iso 200 easily (i'd even try iso 100) using a power setting of 1/8th on both flashes.
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