Not sure if anyone is interested in this but it looks like a nice example of an early e12 model. Restoration appears to be complete less paint. I heard the engine at the BMW concouse event and sounded great.

http://cgi.ebay.com/ebaymotors/BMW-5-Series-1975-530I-e12-sedan-Very-early-car_W0QQitemZ320149205034QQihZ011QQcategoryZ6008QQ ssPageNameZWDVWQQrdZ1QQcmdZViewItem

Item Number = 320149205034

Flatsix
6 cylinders are better than four