My 66 Valiant with a 528 wedge Aluminum heads,intake,carb,mezeiri wp and aluminum motor plate with Dana 60 weighs 3130.....that also has a glass hood and lexan windows everywhere! However I also have a Lenco and Browell bell and they are both heavy and a Mega block which I'm told is 150# more than a std 440. So an automatic small block should weigh at least 250 less than my non factory BB engine and an aluminum automatic I'm guessing at least 100 less. 8.75 grenaded after the first 7200 shift.