Almost every car that races in the F/X (9.75 and quicker) N/SS or Hemi classes run aluminum blocks. There aren't many that have been 9.0 at my weight. With the exception of Caseys B-1 all are lighter than mine. Granted not everybody's combo is the same. But in my mind $7-$8 K for an aluminum block could be used to a better advantage elsewhere. Especialy when you already own an iron block. My Mega Bock weighs 277lbs.
Doug