Matt,
check the CRG web site
http://www.camaros.org/numbers.shtml#67Codes
I believe 2B is 3 speed floor shift and even the very early Z/28 and L78 had a 4code (I think 4P) instead of the 4L or 4K correct codes
If your build date is 6E your vin should be more like N241xxx
I found this on a Yenko dealer network list
Central Chevrolet inc
675 memorial ave
west Springfield mass 01089