Don't rule out the TH400 on a 1970 L78 Camaro just yet..Charley hint hint.
Like most cars,the transmission suffix code & rearend suffix code will tell what engine it was built with on the line,if indeed they are in fact still the original Transmission & rearend.
I am getting more & more inquiries from people asking me what Trans. & rearend suffix their cars engine should have.
I feel those cloners are catching onto this.
You know who you are...