1.5 inch warp is big. Stopping the engine is significant.
I would also look very closely at the engine mounts, the saildrive
mounts, the boot on the saildrive as well as seconding (thirding?) a good look at the prop.
Bending any of the shafts on a saildrive would be pretty significant and would likely result in oil
leaking out or (just as bad or worse) water
leaking into the saildrive.
For this reason I would also look at the saildrive oil
. Milky oil is bad news. To allay your fears about gear damage, any damage might also reveal in metal particles (flakes & slivers) in the saildrive oil as well.
I am assuming from your post that you have run the engine to a fairly high RPM
out of gear and there is no engine vibration when out of gear at all RPM