genIII help
I would do motor mounts, not a plate personally. If I had it to do again I would do spool mounts... I have the earlier buscuit style now.
Gdemon has 5.7 jeep/car exhaust manifolds with the factory k, but you have to notch the passenger frame rail. I think most people use tti headers. You can use SRT8 jeep manifolds with an altercation front end, but I don't know about the factory k.
Those front ends are big money, but will save you a ton of work with fitment of EVERYTHING else. Even with man steering/brakes.
I have a Milodon pan, I think guys have been happy with Charlie's too. There are some that guys have had fitment issues with.
All this stuff has been covered and recovered, read up...