I can tell you what doesnt crash the game, i have a mod with the following changes, Civ 3 1.29 f ( i dont like extension pack for any game).
1.- I reduce defensive value for city against bombing from 16 to 4
2.-I had lethal sea and land bombardement for destroyer,battleshipe,artillery,bomber,stealth bomber,radar artillery, aegis cruiser.
3.- Radar artillery move 2 insteed of 1
4.- Cruise missile got tactical missile flag and aegis cruiser can carry 4 tactical missile.
This is the regular mod i play with, but i get an extra mod in wich i gave the industrial trait to german, they rock i tell you.
I never had a game crash.