eric this is VERy true...carmax put on the sticker for my car that 5.2 was oil capacity....well i put 4.5 in and my dipstick was at the bottom mark...but 4.8 in and it was getting there...well i put the whole 5.2 and wallah wouldn't you know it full...odd thing is that i changed the oil last time and put 4.5 in(our oil pump is a lil off now) and it was full....let it drain a LONGer time this time then the first. Both times it was hot drained. So much in accuracy...but yes with 9 qts in you are lucky you didn't lock up the motor first...bet that thing was a PIG though...talk about NO power at all. That oil musta been fighting that motor like nuts. I think between 4.2 and 5.0 you are okay...they build tolerances in for a reason.
Haha premature failure...try a bent rod when you get that int eh cylinder and try to compress it....and leaking valve seats they are meant to have an oil coat not be DROWNING in the stuff.