Re: lower unit stuck 35 evinrude
Could be the stud is corroded and stuck in the hole. Spray with penetrant oil, and use wedges, like wooden door framing wedges to pry open.
Could be the drive shaft splines are stuck in the drive socket.
Best way to is to hang the whole motor upside down and spray penetrant oil into any gap you can manage between the mid section and lower unit. Take your time, and you may get it to come out. I have heard of people who had to have a welder cut a window into the midsection, and work to get it loose. Then weld up the window. Hope you get it the easy way...Hope this helps.