I have heard a lot of misinformation on rod length, the piston still travels the same distance up and down no matter what the rod length is, correct
I don't believe the rod length affects cam timing, maybe the rod bearing clearances do
I have notice on some RB/B motors with stock rods and loose(.003+) rod bearing clearances that the piston does seem to take longer to get from 2 degrees BTDC to 2 degrees ATDC when degreeing cams
On the last stroker motor I assembled last year, 4.25 stroke with a 7.100 long rod and .0027 oil clearances, it seemed to me that the time at TDC on the piston was shorter than what I normally see, hence the rod bearing clerance affect comment