I would recommend doing a mile marker part time four wheel drive kit in the 203 along with lockout hubs or swapping in a 205 (best option, used in 3/4 and full tons!) 208, or 231 transfer case.
I've read mixed reviews on the Mile Marker. I wish they still made the shaft kit. I may go with a 518 OD if building the stroker, and that it may require a 241 xfer case.... still reading up on that one.