I didn't read all the replies so someone might of beat me to this advice
When listening for noises you can use a short piece 2-3' of a broom handle or a 1" diameter dowel, it works like a stethoscope, Hold one end to your ear and put the other to what you want to listen to. This might help.
Good luck
It might help if you know 5 different guys that haul cars up and down I-5 :) I was quoted friend price of $600 depending on how far off I-5 the truck is located it might be cheaper.
I might just buy a plane ticket and drive it up the PCH for a nice little vacation
Is that 2 eggs and a tube sock laying on the seat?
Who did the engine swap and wiring? How many miles have you put on with the swap? How about a pic of the rear