I've seen it done before, I wouldn't use it really i'd just get it for the novelty of the internet from a computer made in 1989
Yes, the Asant? EtherTalk Nubus card works well. I have that card or something similar in my old SE/30 along with system 7.5 and it works to get on the web... slowly. It's the same card that could be used in a Mac IIsi, so that is another thing you could search for, if you're looking for that card particular card.
You could try to find a Asanté EtherTalk