It depends upon how you have the guitar wired to some extent.
If it's wired in stock Strat configuration, the cap is soldered to both tone controls for the neck and the middle pickups. Since they're both in the low end of vintage resistance range, .022uf, .033uf, or possibly .047uf will work. I'd probably opt for .022uf unless it sounded too bright.
The volume pot may be a different matter. 8.0k-ohm is quite overwound for a single coil pickup. That's in humbucker resistance territory. But resistance alone doesn't dictate a swich from 250k to a 500k pot, it's still a single coil. When I use overwound single coils I opt for 300k pots that actually read @ 300k or slightly higher. I've found that the pickups don't sound muddy that way and even retain a little bit of sparkle that's attenuated with overwound pickups and 250k pots (many of which don't read a full 250k).
If your Strat is wired with the tone control switched from the middle pickup to the bridge pickup leaving the middle "open" (my prefered wiring), then I'd use a .022uf cap for the neck tone, and a .01uf or .015uf cap for the bridge tone.
There are lots of options....
