I'm talking about a NA 6.4 Hemi, like in a Scat Pak. They have about 550 gross hp as sitting box-stock. Just a cam upgrade and headers and they go over 600+ HP. Put that in a 3000 lbs Duster backed by a 904 and a quality converter and see what it runs. I'm talk'n 600 hp the cheapest, and reliable way that drives great on the streets.