Fsst,
That engine is our 427 World Class (4.125 x 4.00), rated at 495/485. The cam is hydraulic w/ 554/558, 250/256 @ .050 on 108CL. The heads are our Windsor Senior aluminums, 2.08 x 1.60. The quads made 500 lb-ft at 3800 if memory serves.
The story and specs can be seen here:
http://www.theengineshop.com/prods_pages/102035.htm