Well, I've been working for quite some time on a '65 Barracuda swap, using a 0 mile (i.e. NOS) 2008 HEMI. I'm currently on a break as I concentrate on another of my businesses, but would love some inside info.
I purchased this engine WAY BACK in 2010, and it has not yet been fired. I purchased a Mopar Performance 77072455AF - Mopar Performance Crate Hemi Engine Kit and am determined to get this to work with the 2008 HEMI I have.
Besides the connector differences, the major change that needs to be made is the change from 32T reluctor wheel to the 58T wheel. I don't really want to pull my 0 mile engine apart to do this, so I'm thinking of retrofitting the 58T wheel to the front of the crank.
My question is: Does anyone have info on the timing of the 32T wheel with respect the #1 cylinder, and where the 58T wheel needs to be for the same position?
Here's a pic of my Barracuda for attention.

77072455AF, as you know, was designed for 2015 and newer engines. There are a few differences besides the reluctor count on the crankshaft. Mainly VVT abs SRV intake manifold. Also, the newer engines make more power and have different operating conditions. You can run an older hemi on a newer harness and ECU if you change the reluctor, but it the GPEC ECU should be reprogrammed to deactivate vvt, srv and the likes. Truth be told, that Mopar kit you have is very valuable as they are often out of stock, on backorder and discontinued time and time again. My recommendation is to sell it and buy the correct stand alone harness for your engine. You may even make money on the deal. Oh and I love the car! My buddy daily drove one in high school and still has it to this day! White 65 with blue interior