That would be Tim Lynch's Mustang you are talking about. World record holder for ET and MPH on a 10.5 inch tire. He was running a 620 cubic inch big block with twin 90 mm turbos. Last I heard, he was going bigger during the rebuild with a big block in the 670 cubic inch range and a pair of 101mm turbos.
http://www.hotrod.com/techarticles/e...ine/index.html