You may be able to do a corrective equalization on those rolls s460s if you have acess to grid power and are willing to babysit them.

Here is the corrective equalization data from Rolls

Corrective Equalization - Method
Corrective Equalization can take a very long time depending on the degree of sulfation. It is not recommended to equalize with a generator as some generators produce low grade AC that is not properly filtered by the inverter. This is especially true at higher voltages.

1. , If you have hydrocaps remove during equalization.
2. , Set charging controls to the highest voltage allowable by the charge controller (inverter). If the bank is severely sulfated or available current is very limited, charge control can be removed or by-passed. Temperature should be monitored very, very closely and keep below 125ºF.
3. , Charge at a low DC current (5 A per 100 AH of battery capacity). If grid power is not available use solar panels or a good DC source when possible. At high voltages, charging with generator can be difficult and hard on the inverter.
4. , Once an hour, measure and record the specific gravity and temperature of a test cell. If the temperature rises above 115ºF (46ºC) and approaches 125ºF (52ºC) remove the batteries from charge. (For temperature measurement choose a center cell, if applicable).
5. , If severely sulfated, it may take many hours for the specific gravity to rise.
6. , Once the specific gravity begins to rise the bank voltage will most likely drop or the charging current will increase. The charging current may need to be lowered if temperature approaches 125ºF (46ºC). If the charge controller was by passed, it should now be used or put back in line.
7. , Continue measuring the specific gravity until 1.265 is reached.
8. , Charge for another 3 hours. Add water to maintain the electrolyte above the plates.
9. , Allow bank to cool and check and record the specific gravity of each cell. The gravities should be 1.265 ± 0.005 or lower. Check the cell electrolyte levels and add water IF necessary.

at that price i would go another route, like a new set of anything that is deep cycle probably can be had for not much more.

forget the charge over the weekend.. even if they come up to voltage
this will be no indicator of what the true condition of the batteries are.

on second thought,, maybe i would gamble at 20 bucks each :)

The price was pretty decent, I was very short of cash, and I bit and hauled them home in a couple pickup loads.

Long story short, I was able to use them for almost a year. However, they were junk, it turned out, no matter what I did to "revive" them, and my storage was minimal to the point all I could really run at night [pv charging during day] was some minimal lighting. I wasted my money, in other words, and was left with having to find a place to get rid of them which turned out to be more hassle than it was worth.

I'd have been money, time, and usage ahead of the game to buy either new or demonstrably almost new batteries in a very small set with what money I had, even if that left me dealing with enlarging the set later on and in that case having to run a bank with cells of differing vintage. Live and learn.

I Tried to revive a few last year that were fresh off a system- and there was no hope for them.  Which was too bad as I could have had 200 of them for scrap value.

So don't even pay scrap value for them, they should pay you to remove them- your gas or diesel has to be worth something.

Their design does not lend them to desulphating.