I've seen people get full turn key junkyard pulls for $1500. Add in conversion mounts and whatever transmission adaptation you might want (flexplate or flywheel) and you can probably be driving a swap for $2500 or less.
LS guys are getting full pullouts for $750 and doing entire old school swaps for $1000-$1500
the biggest hurdle for G3 HEMI swaps are the computer and harness
Places like Modern want $1k just for the harness or $2,600+ for the harness & ecu
LS guys out there have the harnesses for a couple hundred and can flash your ecu for another hundred or so
