Wow, what a find! I definitely would use them. I'm sure you'll find enough in the 32 that are at a similar level to match them up.
From everything I've been reading, AGM, Gel or SLA are so close to each other that it seems you could use the same charger to maintain them.
Yet, maybe set them up as separate banks and use a charger that can handle two different banks individually, or two separate chargers. You could use one bank as a backup, or for completely different loads, like electronics on one bank and house on the other.
Just thinking out loud.
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Steve
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