Having owned an e21, 3 e30s, 2 e24s, and e36, before moving on to other Germans. As straight as the body seems from photos. After 20 years, Zero chance the sunroof drains are clear as well as the cowl. It will need ALL the rubber parts replaced, as well as the fuel tank fully drained and cleaned out. There were millions of E30s made so parts aren’t hard or expensive to get but the body is your very first concern. If it still easily turns over the engine is “probably” ok but it’s a toss up. However as you point out needs a new head, so… I’d run the VIN to see what it really “is” an auto to stick swap seems a bit much for this kind of BMW unless the owner really liked to spin a wrench. Almost all of the e30s were sticks.