Given the engine platforms you're considering, you might want to move your post to another forum; from the Moderators -- "This section is for non-Ford powered FORD vehicle discussions. LSX, BBC, etc. Pertains to FORD bodies with non-Ford drivetrains." I've found this forum quite helpful during my swap.
Having had both a 5.0L motor and, now, an LS3 in mine --- I couldn't ever go back to a pushrod Ford motor. In my opinion, no comparing these power plants in terms of refinement, smoothness and reliable output. LS3 head/shoulders better. Just keep in mind the physical size of the 4V and Coyote motors - lots more room using any of the pushrod options.
Michael Yount - Charlotte, NC - 82 Volvo 242 - 6.2L; '17 Mazda3; '16 CrossTrek