That does make things a little easier (there's no such thing as too much temperature control). I would start out with Chuck's feeling that the steel is something on the order of 1084. It would be hard to tell what the manganese level is in those blades so be prepared for them to be on the shallow hardening side. We also know that they're annealed so they should be soft enough for any finishing that you feel like you need to do. I'm also thinking that if they were ready to harden, temper, and mount that they're quite possibly normalized. I would heat them to 1475° in your kiln for 10 minutes then quench in warm vegetable oil. After the blade is cool enough hold comfortably I would temper in an oven at 375° for two cycles and check for hardness. If the edge chips out at this temperature, repeat the tempering cycle 25° hotter and check again. Keep increasing the temperature until you have it where you want it. Etching with ferric chloride or even white vinegar will see if it's shallow hardening enough to form an auto-hamon and thus a soft spine.
Then test the heck out of the blade. Cut up cardboard of fibrous rope to check edge holding, chop a 2X4 with it to make sure it wants hold up. Then break it to check the grain.
If the blade doesn't give the performance that you want you are just going to have to play with it.
Doug