starting my 2015 vvt hemi journey

I am purchasing a 2015 vvt 5.7 from a charger with 79k to install in my 68 notchback .
I am retaining the EFI and will use the 545 OD transmission or 727 w GV OD. Not sure about the 545 tunnel surgery . Be simple but $$ with the 727 and GV
Plans
Install a little bigger cam , bigger throttle body
> I was thinking of going Holley for the harness and ecu ?
> Is it worth retaining the VVT ?
Any advice or encouragement is appreciated
I will update thread w pictures as I go .