Junction block
Lot's of grounding and attention to detail
Grounding was checked with digital ohm meter
Battery voltage vs junction block voltage was checked. All ok

Voltage drop when starter is engaged was checked in both places as well. All ok

To change the "interface" I cut the terminal off the positive battery cable and soldered copper terminals on.

The main battery cable comes thru the car and enters the engine compartment where the clutch rod would go if this was a 4 speed. A clutch rod boot was used for a seal. Remember keep it simple, this is large jet not a rocket ship.

There are 2 reasons for the battery relocation

Weight location and distribution

A place for the 2 qt electric valve accusump was needed. That is next on the list. The battery tray makes a great place for simple installation. It will take longer to install and wire the lighted on/off switch than install the canister.