On 1st gens the factory offset BBs about 1" to the right to gain some room around the steering gear. This requires different frame brackets, trans crossmember, clutch z-bar. For 69 BBs used a different bracket to mount the 4-speed shifter and longer linkage. The 67-68 BB frame brackets are designed for the 67-68 non-interlock motor mount; 69 brackets are designed for the interlocking motor mount and are shorter. Problem is the 67-68 motor mount will fit the 69 bracket. It will be a sloppy fit. The motor will be positioned too low, you will have vibrations, clutch chatter, etc.
If you insist on doing it wrong nothing will quite line up. And you will have little room for the LH header, espescially with power steering. Header designs are based on using the correct mounts.
I don't believe BB 2nd gen Camaros require unique BB hardware but they did use the HD Z28 motor mount and bracket.
If you're talking 3rd gen you're on your own!