Thanks for the pics. So, the red 'Cuda has the jack slots ('72-'74) but mounts to earlier brackets with all 4 bolts in front. To use my existing brackets that's the style bumper I need. Mine has an April '72 build date, all numbers matching 340 with a forged crank.
It is a bit of an odd fish though, all my research tells me my factory A/C car should have come with a 26" radiator however the original 22" radiator support was cut (with a torch) at a later date and a correct "26 inch one installed. The body shop chopped a right side one out of a donor car, overlapped it over what was left of the spot-welded in original one, and held it in with 2 phillips head crews
I thought that maybe after it was (obviously) wrecked they had to replace the front end yoke and could only find one form a non-A/C car, but the yoke is original with a matching VIN.