Dave you are right, I owned a number of these over the years from my '69 Z days. I saw aftermarket ones on E-Bay or D&R Classics website, can't remember for sure but think they were about $120. Might be a good alternative to an original one.
Yes it's correct throughout the 70-72 Z/28 model years. (It was also used on '69 Z/28's w/cowl induction)
NOTES: Info from M21RSZ28
- The 270 coil was used first used on the 1966 Chevelle w/4bbl and large 17" air cleaner
- The early (66-67) 270 coil letter code was BR (no dash between the B and R i.e. 270 BR)
- In 1968 the letter code changed to B-R (dash between the letters i.e. 270 B-R)
I just did a quick search for them also, and I'd suggest getting one from Northern before they're gone
That appears to be a reproduction. It doesn't have the gutters for the wire end the rest on under the fastener nuts. Also the thin fastener nuts and lock washers as originals do. Also have the same answers as Dave 70LT1Z28. All the letters appear thicker. All call outs to me it's a reproduction.