I bought a 2001 5.9 Magnum out of a Durango. Kept the EFI, changed the cam, valve springs and seals with the heads on, match ported the intake and heads, modified the beer keg intake, SCT tuned it, threw in some rod bearings and a Milodon oil pan. Hooked it up to a nice 727 with 3.23 gears and it hauls something fierce in my 68 Barracuda convertible.
Once I got it all in and running great, I found it only had 90 psi in the number 2 cylinder. The rest pumped 145 to 150psi. It also smokes on the right side on hard deceleration and acceleration. It's been running all over California like this for 2000 miles.
The motor and trans are coming out this year and a new 408" stroker with ported Eddies is going in, a fresh EFI tune from Hemi Fever and it should be in the mid tens on paper with a top speed of 175+ with the overdrive gears. Of course, that is all on paper. Wind resistance is brutal and exponential and that would be scary in that little car. I do think it will be pretty quick with 3.91's and a 200r4 with a 300 stall converter in it.
Either way, I do have a nice, very low mile roller EFI cam and modded intake I will let go at a great price if you're interested. You would have to use an SCT Tuner to get it to run though. The rest of the motor sans oil pan is going to the scrapper. I also have an ad up for the fresh 727, 2200 rpm stall converter, driveshaft etc.