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didn't google it, but I know someone with one, and its got to be a MicroATX, b/c the case is short with a PSU at the top. So no way a full ATX would fit in it.
The power supplies are standard ATX and have been that way for the past 4-5+ years. The stand offs for the motherboard I'm pretty sure are standard (micro)ATX. So you should be ok. Though the airflow is designed for a passive cooled heatsink in a certain place using that green shroud, etc. SO things might be tight or not fit correctly.
You'd probably be best off with a new case. You could reuse the power supply, drives, etc.. or you could just sell the Dell as a whole working computer (worth more). And build yourself a nice little completely brand new system.