It`s a 70 440 HP block .040 over with the 4.15 rods and KB flat pistons. Displacement is 495.6 c.i.. The heads are MP aluminum mildly ported ,2" TTI`s, solid 520/540-286/292 cam with roller rockers, MP dist. w/MSD. The intake is the Eddie 2475 opened to match the heads and the carbs have been rejetted. The carbs are still actuated via vacuum and work beautifully on the street. If I can find my old Direct Connection book I`ll post the section on what Mopar called "one of the best" carburetor set-ups to use for all around performance, the six pack.