It was a very cheap 100 WF Ektar. But thanks, if I get into LF macro in a big way I'll be sure to look those up.
As to swapping cells, I was hoping that changing the spacing would just do something like changing the focal length a tiny bit, but no such luck, huh? As to a "normal" shutter, Ole, mine is a Kodak Flash Supermatic. I have a Wollensak (X) Synchromatic shutter with the same thread size, but I suppose there's no way to say whether it's spacing would be same as the lens requires.
Really I suppose the question of reassembling lenses should be a new thread anyway. Thank you all for your replies, you've been very helpful.