No thoughts really needed here. Good parts. If his car has a k-member that is already modified, those will bolt a 273 or 318 engine right in. If you shim them with washers or spacers, it should fit a 360 right in there too, as the only difference is distance between the mounting ears on the block.
He didn't even have a '73 or later /6 car. The '74 Charger was a factory small block car. I know there's no spool mount k-members here, so they may get sent out the door.
