I have the address at 509 Harrison St (U of M Flint Early CDC) as it was on the lot next door according to a 1983 aerial photo. The geodesic dome structure with the fins on top is unmistakable in the 1983 photo. Even though that was not the exact address when the place was open, I will use it for reference purposes as the empty lot where AutoWorld was has no address.
I visited AutoWorld not long after it opened, I was excited to see it but was also pretty disappointed when I did. Most of the exhibits seemed to be cheap, many of them just pictures or plaques with a few videos. Not too many actual cars were in the place from what I remember. The area where they re-created downtown Flint was kind of cool as well as the indoor Ferris Wheel. I think they could have executed the idea better and given more time, it could have succeeded. Unfortunately it was closed after a few months of operation. Many ideas were considered to either re-open or re-develop the attraction as the articles below attest to. None of them came to fruition.
In 1984, the $70 million AutoWorld theme park opened in Flint, Michigan, amid much fanfare and hoopla. Situated on nearly seven acres of land downtown, the park was supposed to draw 900,000 visitors every year and help revive a dying inner city. It had the enthusiastic support of city and state officials and many big-name Flint citizens. Half the $70 million it took to build the facility came from federal, state, and city governments. Sixteen years later, nothing remains of the park. Closed after less than two years of sparse crowds, and then later demolished, the site is now part of the University of Michigan's Flint campus.