I would just buy cheap truck block, car front cover, and rest of the stuff solitary, like good forged stroker kit for lower compression etc. if you are going to strengten the bottom and go with ported heads, you would not have any use for stock rotating parts anyway.
Truck cover might create issues with Kenne Bell, at least there are more options for Chargers and Challengers than for older RAM´s.
VVT problematic with cam choises and maybe problem with Megasquirt, I am not sure can latest version control timing of that. VVT came 2009, MSD after 2006 or around it.
I have been thinking also supercharging, I am running 5.7 with a basic tune up´s, good thing is that I use allready FAST Xfi, so upgrade would be a bit easier.
Good luck anyway for your project!