I'm pretty sure 71 1602's came with updated clutch and brake booster. I know mine does. LSD is from a 320is.
Update:
Still doing a lot of priming and block sanding, but I'm getting close to finishing. Below is a rendering I made in Illustrator of what my goal is. Bristol paint with satin black hood and trunk. Other contenders were Florida, Polaris, Tampico, Derby, and Turf Green. In the end Bristol always took the first slot on my goat list.
I've also picked up a Getrag 245 off of eBay. I paid a little more than I wanted, but trying to find one on the east coast has proven difficult. No plans to install it anytime soon, but I thought it would be best to grab one now since every year the prices seem to rise on these things.