Mark,
Just want to be sure that's correct, according to the Camaro restoration guide, page 114 states 477 is PS for 67-69 and PW for 69 only (that's were the confusion comes in) and 851 is UN for 68 only. TN is listed as 3192832 for 68 4spd w/o F41 & 69 L34, L35, L72, L78, L89. This is why I am having so much trouble locking this down, I can't find anything that states the applications clearly. Just curious, where are you getting your info from?
Thanks, Chris.