hemi.. Oh yeah. dont forget to pay attention to the exhaust stacks and manifold covers.. they are Oft neglected to get them looking right and one of my major peeves lol!!! Sierra can make great retracts for sure... When you look at Brison and their Revolution 52.. you can download the drawing and then see how it fits into your proposed fuse if you have CAD...that really helps for sure. BobH.