276 stroker from 35 years of parts

[GB SISSON]

I started rebuilding the carb last night. It had #49 jets in it. I rummaged through a box of incomplete carbs and found a set of #50s and a single 51. I did some searching but haven't found a source for the 51 or 52. While I have almost no experience with jet requirements, it seems the #50s would be fine and good for the initial start, but would be nice to have some bigger ones on hand. Source? Maybe Charlie NY? Also, is there a specialized screwdriver for jets? Ever since I was 15 and heavily into briggs and strattons I have made a lot of screwdrivers to fit jets but they are never quite perfect. The carb kit I'm using is not a Daytona. It's new and fresh but has a traditional needle and seat, but viton tipped. I loved those in my early briggs and stratton days and then later my thumper british bike phase. I do have an nos needle and seat too. Thoughts? Thanks in advance, GB