An industrial grade 540 has a sealed endbell. A "stock" RC motor has an open endbell, with replaceable brushes. Usually.
The biggest problem you'll have with the 1/10 is weight. If you mount it to the left or right, you'll have a balance issue. Mount it above the shaft, you'll have a high CG, and have roll issues. It'll definitely be quick, though. Oh, and achieving a suitable gear mesh will be tough, given the radius of the can. You may discover that a large enough gear on the shaft will extend below the current boundaries of the chassis. It may require a third gear between the pinion and spur on the drive shaft. No matter how you look at it, its going to require some fabrication to be worthwhile. The stock suspension will be totally ineffectual with that sort of weight. I'd really suggest a smaller motor.
For the 180 size, I highly recommend looking for Tamiya mini 4wd gears. They're cheap, easy to get, and strong (enough). You also have some flexibility in gear ratio. For the motor mounts, look around for the motor mount to any of the 1/24 pan cars. That will allow you to adjust your motor position, so your mesh is correct.
http://www.tinyrc.com/forums/showthr...&threadid=6484
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