The proper answer to your question is, no there isn't a Spec Slash class. We run 2wd Short Course as an Open class. Any motor, running on a 2s Lipo battery. There has been no interest in running a 2wd class outdoors in recent years. So you'll have to wait till indoor season begins this fall.
Yes you can race your electric powered 1/10 4x4 or 2wd Slash at the track. 2wd races are held during the indoor racing season check Facebook page for info. 4x4 can be raced both indoor and outdoors all year check posted racing schedule on facebook page.
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