I vote for the Gen III Hemi. While freshening up our Gen II Hemi in the 64 Lightweight we decided to weigh it. The old iron headed girl weighed in at 720 lbs. When we pulled the Gen III Hemi out of our 09 Challenger Drag Pak and weighed it. She came in at a whooping 460 lbs! And the all aluminum Gen III Hemi race blocks are reported to weigh 90 lbs lighter. 370 lbs for an engine that we can make almost as much or more hp/tq as the Gen II Hemi fat girl. If the old race Hemi ever decides to give up the ghost, a Gen III Hemi will take its place.