I believe that the 12" Ilex Paragon you mention is a Tessar-formula lens that will not cover 11x14 at infinity... can't comment on the 12" Dagor, but they are supposed to cover very well when stopped down. An Ilex Acme shutter that has been serviced in the last decade should be just fine.
There's a great deal of LF lens information on the front page of this site, if you want to wander around over there.
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