I have used elephant ears to install B,RB and 426 hemi in Dusters and Demons, I would bet money that you will save around 18 to 23 lbs by using them, especially if you cut all the stock mounts off of the K member I have two motor plates in the shop now on motors, I'll bet money there is not 3 lbs more weight in them than the eelepahnt ears They can be trimmed down a bunch also Now, Get after it