Congratulations on your '69 RS. Tell us a little more about your ride. I also have a '69 RS and would be glad to compare notes some time. I believe the A249 number that you found on the carrier is the casting date, i.e. Jan 24, 1969. Your cowl tag indicates that the body began to be assembled during the first week of Feb 69. That agrees well. The axle code is on the front side of the tube on the passenger side. See the following CRG link, http://www.camaros.org/drivetrain.shtml#AxleCodes
for more information.
I believe your block came from a 1972 truck application:
V= Flint Engine Plant
0823 = August 23
According to the following link: http://www.nastyz28.com/gm-chevy-codes/chevy-engine-codes-suffix-7.php
TDR = 1972 350 175 HP, 4Bbl (K-10 & 20 truck application) Note: This code was used again in 1980 C-10 and C-15 truck use