Thanks for ALL the feedback! @thisismatt, clearly IRS is a full time thing. I'm not new to the car world. but thank you. I am sort of new to datsuns and am really excited to get my pickup back on the road. I do have a full machine/fab shop at my fingertips so the work isn't the issue. However, being relatively new to Datsuns, I didn't know if there was a particularly common rear end swap.
@DTP, thanks for all the info. I may leave it alone for now just to get it on the road and to a couple of events. I look forward to meeting some of you and seeing what you've got...