No such thing as a "turbo" block. A 3.8 is a 3.8 (unless it's a 4.1 wink ). Find a good block with a 2-barrel carb and get it (cheap). The later the casting, the better. Most people seem to think the 1986/87 casting ending in '109 is magical. All it will need is a oil return line hole drilled and tapped.