decoding bbc

[AnthonyF]

Hey guys I'm new to this forum! I have read a lot of info on this site about the subject of decoding chevy big blocks thus making me want to ask my questions here. I have attempted to find the info i seek by searching and reading numerous sites, but i cant decipher all the information out there. last weekend i bought a 78 chevy silverado k30 to use all of the 4wd components to convert my 79 c20 to 4wd. this truck had everything i needed and a plus, it came with a great running "396 out of a 67 chevelle". today i pulled the motor and got a look at the engine numbers. being only 21yo i am a complete rookie at anything to do with motors. after a little research i came to find the numbers and came up with this:
front passenger side under the alternator: 19C013942
B 3963512
(sideways T)
also found:
CONV 2
GM6
have pics included. motor is still very dirty (just pulled today havent washed it yet)
ill know tomorrow whether it is a 4 or 2 bolt after i get the tranny off and engine on an engine stand
from the info i found earlier, am i correct to say these numbers would put this motor as a 1969 427 or 454?