[Izzy Dunne]

approximately 2,000 40-pound, 10-inch-long bars.

40 pounds = 40*16 = 640 ounces per bar.
2000 bars = 2000*640 = 1,280,000 ounces.
At $350 per ounce, that's $448,000,000.

FWIW.

[Cicero]

I see you did the numbers faster than I did.

[SAJ]

Gold is measured in ounces Troy, not avoirdupois. Only 12 to the pound.

Suggest reducing your estimated valuation by 25%.