LS ECU is best mounted where ?

[LS short box]

Thanks for the kind words engine bay wise.
As with any project to each his own on the build.
My current 80 Camaro project LS3 swap and a 73 Camaro LS3 project I did a number of years ago. Tried to hide as many wires as possible. LS engine/trans harness and stock Camaro chassis wiring harness.
ECM and TCM are attached to the heater housing on the inside of the car.
On the 68 pic you can just see the grommet for the wiring harness slightly above the back of the right coil cover. I would of gone lower but I needed to clear the heater housing on the inside. Unless there is a major problem all trouble shooting is done thru OB2 port.
Couple pics of the orange 73 and blue 80 engine compartments.