Speed-O-Motive makes a 383 kit for the small journal 327 block. Check it out, then check out these dyno-proven small block Chevy combinations. Go through and pick out the 383 builds and pay attention to the max torque and the rpm's where it comes in.
http://www.speedomotive.com/ps-30-8-...3-cid-kit.aspx
http://www.ryanscarpage.50megs.com/combos1.html