MinnMan

To each their own, but maybe the OP should consider a different century. I have no experience with this particular event, but from the descriptions here, it sounds very tough.

When the OP states that he's done a couple of centuries before, though a few years ago, he doesn't say how much climbing those other centuries had.

I do centuries all the time - I've done one each of the last 3 Saturdays- but on relatively flat terrain. But I've done centuries with >10,000' of climbing only a few times. They are different animals.

A modestly hilly century, with say 5000 or 6000' of climbing seems like a sufficiently tough goal. If that goes well, then maybe next year for the 6 gap, and begin the training earlier in the season?