Buses make a heck of a vibration when they go by. I used to work
in a building on a bus route. The whole place shook.  T-Max 400
can be enlarged quite a way, and doubt too many people will have
their noses in the print looking at grain. Grain and any minor
softness will be unobtrusive at viewing distance. If you've
never handled an 8x10, I'll tell you that while the rewards are
great, the hassles are many. Good luck on your project!  Peter
Gomena