To the best of my knowledge there are three direct bolt on aluminum heads for small block Mopars. Standard Edelbrock, Indy modified Eddys ie. Indybrocks and the Chinese cast Airwolfs. I think the most interesting comparison would be between the Airwolfs and the Indybrocks since both appear to have a slight advantage over the standard version. Obviously it would be best to have equal levels of prep in order to have a fair comparison. Indybrocks do require rockers with greater offset than standard [ any standard big block rocker will work ], but since they come with rockers, shafts and 3/8 studded holddowns they can still be considered a direct bolt on. I would like to see what the hp/torque vs. cost ratio is for all three.