The week, and Voltage stock is much, much more important than the stepping.
If they are DLT3C (1.5V) processors, of a recent week, (younger than week 38), then they will almost definetely overclock *quite* well - being the most recent unlocked Thoroughbred "B" DLT3C processors.
Newer is almost always better within each "type" of processor - DLT3C T-Bred "B"'s being a type, DUT3C T-Bred "B's being a type, Locked Barton's being a type, Unlocked Barton's being a type, etc. Within each "type" of processor stepping is more-or less irrelevant, week of production being the main, and only proven, indicator of how well the chip will scale. A JIUHB DLT3C T-Bred "B" and a JIXIB DLT3C T-Bred "B" of the same week should both overclock about the same.
If they are DUT3C (1.6V) Processors, of the locked week (38), or even unlocked (<38) then they are pretty lame overclocking chips - the DUT3Cs all cap at around 2100 MHz, with a lot of Vcore, as Arkaine found with his DUT3C KIUHBs.
What are the full steppings on the processors? Could be a great find!
(although 98 dollars seems like a rip off to me)