the 5vz would bolt right in and fit your tranny and motor mounts. with the extra power you wouldn't have to abuse it as much to get there. with the 22re you'd have to change your tranny, motor mounts and a bunch of stuff. less power but it's hard to kill an 22re. a lot easier to work on and tons cheaper if ya do. 3rz are cool but ya get back into more money again, lots of mods but marlin has a bellhoueing so you could use your tranny. all are good. if it was me, I'd just wait for the best donor rig and use the best deal.
