How deep do you want to get into it?
Those early 383's can be woken up with intake and headers. Like was said before, it's got a baby cam. The heads are also pretty poor.
A lopo 440 is going to suffer from it's own shortcomings
I agree that looking at putting the car body on the Jeep is likely the easier option.
If that boggles the mind then you don't understand the awd swap you asked about yet...