Seized injectors

My car runs E85 and I had the engine rebuilt late last year, so it has been sitting around for a long time.
It's finally all back together and it won't start.
I've figured out that the injectors have seized. They are quite new though I believe that this is a common problem with E85.
I have them soaking in WD40 at the moment and I have tried tapping them with a hammer etc and they are still seized.
Any ideas?
I obviously don't want to buy new ones seeing how these have only done one track day and a couple of dyno sessions.
Thanks