'69 L78 Camaro negative battery cable hookup

[Unreal]

I think the neg cable attaches to the block on all b/b in 69. I looked through my 69 AIM, and found no details of battery hookup for L78, or L34/35, for that matter, to confirm or discount that opinion. I did find a reference to grounding to the alt bracket for V8 engines in the electrical section, but I think that's for s/b only.
My correct 69 alt. bracket has 2 holes, about 1" apart. One is for the heater hose bracket, and the other is for? I guess it's possible the neg cable attached there, but I don't think so.
The alt. bracket in SSJunkie's pic is for 70 and up b/b, and has several extra holes. Is that bracket correct for any 69 b/b? Was it used on the late engines with the 3 letter CXX engine codes?