Looking for advice. Want to build a Duster to run on a budget.

cheapest way to build it wouidl most likely be a 360/904. 4k will be tough but i think it can be done.. how bad is this 800 dollar duster?

https://www.facebook.com/marketplace/item/1708828709789927/
this was the car he linked. so, about what i would expect an 800 duster to look like...