top or bottom??
If you have no cherry picker, you're probably not set up to get the car high enough to drop the cradle and get good access to the motor. So you'd probably be better off just doing the h/c swap with the shortblock in place.
Don't bother either way, just start pullin' parts. 
Other problem with dropping the cradle is having to get an alignment and bleeding the brake system. Not worth it for 'just' an H/C swap, especially without a lift.
Good luck,
Andrew

