Buying a motor this weekend (need advice)

As I am pretty new to the Foci world I'm not up on the issues and the things to watch out for that every different make and model usually has (example: my old civic and it's rusty quarters). So I thought I could get some tips on what to look for buying a motor, or maybe I should steer away from certain code numbers ect. Anyways, I found a 2001 Zetec for my SPI wagon that includes the trans, wiring, computer, gauges and ignition for a resonable price and wanted to make sure it was worth picking it up. Apparently the motor has only 7000kms on it and the gauges read that (don't know how else I could proove it). So lastly my other concern is can I use the auto trans in my focus now on the Zetec motor or is the transaxle completely different (hence possibly having to get the axles aswell? I plan on getting urethane mounts so I dont care about getting those from the seller. I know this would all be much easier with a donor car but that's to much moula and I got this set-up on the cheap if I buy it.

Cheers, Mike.

Sorry if that ran on a bit.