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The NP435 is a truck transmission so I'd look at the truck 4-speed hogs head to see what it would take to adapt.
The New Process 435 is a later model transmission that I have never seen with an overdrive. I've seen transfer cases but not a B&W R10. Ford used the T85 R11N transmission as it's last heavy duty overdrive application for pickup trucks up to 390 CID in 1969 & 70. The NP435 doesn't have any form of reverse lock out so a person would have to be careful if piggy backing an R10 unit off the back somewhere.