Hang on a minute wasn't the 78 and 79 engines somewhat different. The 79 is really nothing more than a derated 8210 and the 78 engine different at the bellhousing end to fit up to the 7610 backend?Whether you would get that much i dont know ?
http://www.ebay.co.uk/itm/Ford-7810...727530?hash=item33c292b8aa:g:fqAAAOSwMVdYIIjz