I removed all the Megajolt bits and wiring. I also ordered a 6 fuse power and ground distribution block for $15 delivered, should be here tomorrow. It's 3.5" square, so it should fit nicely on my back board.
I'm reusing my old relay board, it's from a 1990 Subaru. Very thin and compact for 3 30 amp relays.
The wires coming through by the shift cables are the Vintage harness. Black is switched ignition, orange to the tachometer, light and dark green to the GM oil temp sender, and purple to the oil pressure idiot light. The last three have nothing to do with the EFI, but the harness needs to be inside the cockpit. I'll heat shrink and tuck them under the board.
I'll connect the ground bus to the steel center tunnel and run an always hot lead to power it all.
I also found a Chrysler idle air control(IAC) stepper motor and wire pigtail for $10 on eBay. I'll make a manifold out of a hunk of aluminum and put a tiny breather filter on it.
$1025 so far.
Forward progress.