65 273 V200 4dr

I'm considering a nice original 65 V200 4dr with auto and a 273, but since I'm only familiar with later A-Bodies, I have a few questions: 1) Does this car have a 904 or 727? I know 65 was the last year of the original 727 and in 66 they modified the transmission and case a bit. I just don't know what the 1st year for the 904 was. 2) What differential is this car likely to have - 7.25, 8.25?? 3) I'm assuming small bolt pattern, yes??? Thanks in advance!