Do you know if anyone is running those mounts on an A-body at all? I'm just thinking that there's going to be very little room for fans and pulleys up front. On a B/E the radiator clearance is a whole different ball game.
Just went out and took some quick measurements of my current setup and the mockup.
Looks like it is about 2.5" to the end of the crank pulley on the 5.7 to the pinch weld on the k-frame. Note this is a truck crank pulley, not sure if a car is shorter or longer, but I'm pretty sure they are different.
My current 360 w/ PS is about 1.75" from the end of the crank pulley to the pinch weld.
So the accessory drive on the Hemi will be something like 3/4" tighter.