As it says.... maybe need to ask if this was a Euro, and what the KM's were Ian?? Could be a worthy source of parts and split the cost?
http://cgi.ebay.com.au/1978-450-se-sel-Mercedes-Benz-Motor_W0QQitemZ330241661637QQihZ014QQcategoryZ161425QQssPageNameZWDVWQQrdZ1QQcmdZViewItem
http://cgi.ebay.com.au/1978-450-se-sel-Mercedes-Benz-Motor_W0QQitemZ330241661637QQihZ014QQcategoryZ161425QQssPageNameZWDVWQQrdZ1QQcmdZViewItem