About thermostats and such, I run a 190 degree thermostat in the Y block powered vehicles I drive. Of course, I also have 4 row radiators. If you go with original 2 row and depending on your climate or what kind of weather you drive it in, you can always go with a 2 row radiator and 180 degree tstat.
For my engine run stand, I have an electric fan now that I use with a switch mounted on my panel. Very easy to operate. Once the coolant gets to 195 or so, I hit the fan for a few minutes. 2 row radiator on the engine stand. 180 thermostat.
The parts stores may not have knowledgeable folks when it comes to cross-referencing, etc. I usually ask for a Chrysler thermostat. The 60s thermostats from Chrylser had the larger opening like the original Y block thermostats. You may want to do something like that and compare the holes. I would not suggest running without a thermostat. Your coolant/water needs to slow down at some point so that the radiator can do its job and bring the temp down as the coolant falls down the rows.
As far as "burping" in concerned, things should be straightforward unless your radiator cap is mounted BELOW your intake manifold. If that is case, you might have some issues with burping, but I think that was only with the early 60s Galaxies that had Y blocks. After filling full with a cold engine/cold thermostat, I always leave the radiator cap until warmup of the engine opens the thermostat. You can visibly see the coolant level recede as it fills all the nooks and crannies. Of course, you can also close everything off, check your upper radiator hose temperature by hand, run things until it gets pretty hot, shut it down and wait for it to cool, open the radiator cap and basically the level will have already gone down.
Nice to see you able to move along.