Just purchased 1968 RS/SS, 396/375, 4-speed, NOM. In car now is a 396, on the engine pad are numbers and letters, can't find anything that tells me what I have. Any help would be greatly appreciated.
Engine pad reads as follows: T1221 IV 18F157000 (this last set of numbers are really faint, this is what I make them out to read. Also, is this the correct way the pad is stamped? Thanks to everyone for their knowledge about the Camaro.

 

Ok Ill take a shot at it but I aint an expert so I included a source link.

T= Tonawanca engine plant
12= cast in december
21= 21st of dec
IV= 396/325hp turbo hydro the 4 speed 396/375 code is MQ

1= chevy
8= 1968
F= Flint assembly plant
157000 serial # sequence???

http://www.chevy-camaro.com/chevy-ca...s.asp?group=10

Check it out better I just did it real quick I could have messed up but I think it is right.

 

surf through these 2 sites, lots of info
http://www.chevy-camaro.com/
http://www.camaros.org/index.shtml

from what I cant find out
IV 1965 396 325 Chevrolet
IV 1966 396 325 Chevrolet
IV 1968 396 325 Chevrolet
IV 1967 396 325 Chevrolet AR