So the list in that post is from the AIM of course, so you have to assume the part numbers were based on the "standard" rear gear ratio (as well as the actual trans model).
I think the "standard" rear gear for a manual SS/LM1 Camaro (3950356 - L48, L34, L35 & LM1 (assume Muncie M-20) was BS 3:31. Which explains the grouped engines with one trans number.
Of course if you ordered a non-standard rear gear, the trans model may change
Sal, with your SS350 BS 3.31 gear I think you need the 3950356 tag.
I have an SS 350 with BS as well and need the same tag