Baer ATS brake setup- will it work on stock spindle?

[F'in mine]

Fairly new here........was wondering if a Baer ATS/ hub setup for a 1969 Camaro will work with stock spindles & drum hubs?
Realize that the steering components are 2nd gen style but it looks like the factory steering arms will work. Don't know if the measurements from the wheel hub mounting surface to the caliper mounts will jive.
Reason being is I have a chance to buy a 12.79" setup at a reasonable cost.

Any input or help would be appreciated, thanks in advance.