383 block, .040 o.s.--440 steel crank offset ground to 3.900--451 c.i.--6.385 rods--Zero deck flat top pistons--10.75 to 1 CR--Ported 915 heads--Racer brown STX-21 solid flat tappet cam--Victor 383 intake--995 CFM carb. 2500# Lebaron went 9.02 at 150mph with this engine. Wallace calculator shows 675 HP.