The right place for bleeding the system is at at the highest floor, since that's where the air in the system tends to collect.
Hanging the pump torquing on a soldered ell like that is asking for trouble, and is almost certainly contributing to the noise issue. It needs more mechanical support to get the vibe down. Mounting it vertically so that it's pumping direction is UP relative to gravity reduces impeller-eating cavitation too (which can also add to noise levels.) While you're at it, get the flexible conduit for it's power feed out of the dirt too- put a conduit clip onto the side of the boiler jacket if you have to.
Taco makes a gazillion pump models. Yours looks like one of the -007 flavors, which is a standard pretty-good pump. Whether it's the right pump for the application depends on the pumping head of the system & boiler, and the flow requirements of the system/boiler.
BTW: Is there an expansion tank on this system? If it's a pressurized system (usually the case if you're running only hot-water radataio) normally when pumping away from the boiler as it appears in the picture the expansion tank is best between the pump & boiler, but sometimes it'll be installed nearby on the return side of the boiler (not best practice, but can still be OK.) It's hard to tell from the pics what the near-boiler plumbing and system plumbing configuration really is, but there doesn't appear to be an expansion tank in any of the usual near-boiler locations. With the expansion tank at some random placement on the system you'd get much more vibe & cavitation at the pump too.