67 W200 Which motor would you use?

On the brakes there are {or were} disc brake kits that use the drum brake spindles for A B and E bodies, the B&E using the same brakes/spindles from the factory, but the manufacturer escapes me just now. Master Power maybe? Saw the article in an old issue of Mopar Action, but whether they are still available or how decent they are, can't say.

Point is, Ma Mopar's frugality often led to parts bin scrounging so it's entirely possible the B&E drum brake stuff may have the same bolt pattern on the backing plates. Keep in mind those disc kits aren't designed for a king pin spindle on a straight axle, even if they would bolt up you may run into issues. You might look into it and see what you can find out.

I'd keep the 383 btw. Check the valve stem seals. Might have crumbled to dust by now.