It is a 528" world block, 4.50 bore with 4.15 stroke, around 14.5 to 1 compression. Ross gas ported piston with the light tension ring pack. Scott Brown roller cam, 720/705 lift with 276/284 @ .050 and 113 lobe separation. Indy SR head ported by Brian at IMM in Indio. Pro System build 1150 cfm carb. 727 tranny with 4.56 gears. This combo is pushing 3100 lb Duster down the track pretty good.

1.298 60 ft 6.001 1/8 mile 114 mph 9.52 1/4 mile 140.87 mph @ 3110 lbs