Meh, if there was no engine damage, leave it for a couple of days with the doors open in this heat, put a dehumidifier inside for another 2 days and I bet you it would run like absolutely nothing happened.
It wasn't salty water damage so everything is 'recoverable' and there is barely anything under the radio level so if there was no battery connected, everything should work when dried up.
What I would do if this was available here, I'd check if definitely no water got into the engine and if you're sure that this is ok, then I don't see much of a problem rly. If/when you get it, simply dry everything up(as above) remove everything from inside the car, down to bare floors and start cleaning.
Flooding it probably wont help with a couple relays that possibly got wet behind the radio or bolster panels and fuseboxes will need redoing(but they would need that anyway) but dehumidifier inside coupled with maybe a few good hours of running an ozone generator inside should bring it back just fine. Its not a modern car with CPUs everywhere so dont expect a total loss for sure.
When all dried up, simply plug in a adjustable DC power supply instead of a battery and crank the amperage up slowly, should show up very quickly if anything is shorted and how much power it uses, if it doesn't and everything lights up, put the battery on and crank it up, I bet you, you'll get very surprised.
1996, 3.2 SWB X300 - Relatively rust free daily driver!
1997, 4.0 LWB X300 - Unlucky car, sold 10.2020!.
1988, 3.6S XJS - Never ending restoration project.
1994, 3.2S X300 - Accident damaged, 10.2015. Gone!
1994, 3.2S XJ40 - First Jaaaag, long gone.