If your E30 is *NOT* your daily driver, and is more of less a "weekend" car you potentially qualify for classic car insurance.
you must: be 25 years old or older( I believe)
have a clean driving record
prove that you have a 2nd car, insured elsewhere as your daily driver.
if you can meet these criteria, you likely would be able to get a Silver Wheels plan through Lant Insurance company.
I have this, and it costs me $118 per year, $9/month.
however, my e30 sits in the garage 99% of the time.