Radiators: Is 22" enough for 400 HP?

I'll guess that the crookedness is due to the rad sitting on the bottom edge of the core support. I'd push down that lip on the core support for 2 things:
1) Get the rad straight
2) You don't want that AL rad restring directly on the core support; it will chafe the AL and may eventual wear through

You can avoid some issues with the bigger alternator and the ammeter by putting the fan through relays directly from the alternator. Of course, that won't fix the big alternator pushing a high level of charging current into the battery via the ammeter....