It's a while back, so I'm not certain - but I think most of the pics of the Desert Race on Freebooters are uncropped. I really was that close - lens set at around 80mm, close enough to get showered in dirt as the cars went by
. Check the proportions of the images - if they're pretty well exactly 24 x 36, they're uncropped.
I've just looked at 'Chucking the dirt around'. It is cropped, but mostly just to eliminate empty sky. I think I left too much free space in front of the car, though - you can crop more than half of that away without having nowhere for the car to go. If anyone is keen to have a go, try framing it with the front coming out of the frame, but since I didn't get the whole of the rear wheels in the original slide that may not work too well.
Although the original scans were about 5300 x 3500 pixels, only a few are sharp enough to tolerate heavy cropping or big enlargements. Image fuzziness is mostly camera shake and depth of field - I was using ISO100 slide film most of the time, in mid-morning sunlight.
If the driver's face had been lit, it could have been worth cropping really tightly on the side window - you've chosen one where focus was on the middle of the car, rather than one of the ends