Lots of questions on what ignition coil is original. An often changed part and the original configurations are poorly documented in manuals.
One thing to know - the coil and bracket were shipped as an assembly to the assembly plant. What is a bit different is the last three digits of the assembly part # were the numbers embossed into the coil. The various brackets changed the angle /location of the coil for clearance.
Also the BR embossed on the coil went to B-R for 69 (the drawing change was dated 9/12/68)
What I know from the AIMs and broadcast sheets and car data.
67-69 L6: 1115208
67 V8: 1115267 used on many applications including LF7(base 327), L35, and L78.
Appears 270 and another coil (290??) were used on SS350 and L30 cars. It looks like the wiring harness and ignition resistance wire changed and so it may be an early vs late thing.
68 V8: 1115293 - all engines
69 V8: 1115293 - used on all engines except below
1115298 - Z28
1115270 - Z28 and L48 with cowl hood (but not BB with cowl hood)
1115210 - ZL1 TI units
After pulling this together, the biggest question is the coil for the 67 L30 and L48 cars.
And the differences between the brackets.