Thanks, and yes, it's an L35 (396/325), not an L34. I mis-typed! But remember, I am
NEVER wrong! (Once I thought I was but I was mistaken.)
The transmssion codes for the Turbo 400 were used to indicate what model car it was installed in. C would be a Turbo 400 installed in a 69 Chevelle or Camaro with an L35 engine. G is for a full size car with a 396/265 (and a 2.29:1 axle). There were others as well:
A - 396/325 or 396/265 in a full size passenger car
B - 427/390 in a full size passenger car
C - as above
D - 350/250 or 327/235 in a full size passenger car
E - 396/350 in a Chevelle, Nova or Camaro
etc...
Ed