>>4395417If you're in love with toyo get the toyo board. If you don't love toyo or can get the linhof board cheaper do that.
You may not notice too much of a difference between 75 and 90 as well. This was taken with a 90mm on 4x5. I'll post a 65mm shot as well.
Doesn't look like there's any way to attach a helicoid to the lens. I have a 65mm super angulon that has a helicoid. Kinda nice...