Thanks Tom for helping out a Newbie. I did the on-line decoder you suggested. I also checked Chevrolet by the numbers 1965-69 by Alan L. Colvin and Camaro restoration Guide 1967-1969 by Jason Scott. No specifics found to point either way. I did find something of interest on this site.
http://www.camaros.org/numbers.shtml#CowlTag 2M PWR GLIDE AUTOMATIC (NOR - only applied when D55 was included) (LOS - used in lieu of 2Z for the M40 TH400). 2Z THM400 3-speed automatic transmission (NOR only). Am I reading this right that my vehicle did come with a TH400.
As for engine being 210HP (LF7) or 275HP (L30). This is what I found
http://www.camaros.org/l30m20.shtml . Seven different variations exist for the L30. Mine could fit
1- early L30/M20 cars with neither 4P code nor 12-bolt axle (early non- or standard-ratio posi production), or
2- a few L30/M20 cars with 12-bolt optional-ratio posi axle (non-radius rod) but no 4P code (early production),
The confusion continues. Open to suggestions. Thanks again. Claude