You can get a weber downdraft or us a set of side drafts on the 320. the engines in the 2002s and 320s are very close. I think the only main differnce is the distributor spins the opposite way.. So if you want a carb car. Get a 320 with FI.. if it runs leave it alone. Or find a Carb kit for a 2002. It will bolt right on. You may have to fabricate some sort of throttle linkage but thats it.
Or the grey maket e21 320 six cyl cars have carbs. But the only ones I have seen are Baurs.