start watching for an intermediate gear for each wheel first off. These are "double reduction motors" with more torque/less speed.
There are armature differences, etc.; and some characteristics to running a few motors that make me think that the motors were tweaked in some applications, cost vs power..? But for the most part I haven't encountered anything to really complain about. (I have had a 90s motor become a mysterious PITA, but I didn't baby it when it showed signs of distress. It melted the armature bearing hole in the brush plate as that one isn't fiber. I rebushed but it simply won't make torque anymore. Unbushed, it's fine. Plastic bush, same thing. Spins like a top, just zero torque.
If you pull steam wheels, beware. They can be brittle and for some reason nobody will re-pop some nice new ones.(Robert Grossman Co in Ohio best for parts imo if that hasn't been mentioned.) I'm thinking mylar tape between wheel and jaws maybe 🤔
You can always print any car you'd like on paper/sticker and wrap a crappy car.
There was actually a business doing that about a decade ago. Files for some are likely online or at least at the "Wayback Machine" archive.
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