Carryovers are kept in both AMT and "regular" tax whether or not you hit AMT. You must prepare both forms, every year that you claim a foreign tax credit.
The Line 8 instructions are a few pages, and those really only apply when you do have AMT.
Directly from the special situations link under the Alternative Minimum Tax heading in the first link: "You must prepare separate Forms 1116 to compute the foreign tax credit and foreign tax credit limitation for alternative minimum tax purposes" [emphasis added]
Unless the election is made for the simplified method, it will calculate the other. Once the election is made, it can't be revoked without permission of the IRS. But whether it is calculating simplified or not, the AMT 1116 is required for all taxpayers claiming foreign tax credits.
If you made the election and a year was calculated using the other method, you should amend the return for that year to have proper carryover amounts reflected on your 1116B.
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