Yep..and yep.
Your Angels may chase the gourami's..but actually...your gourami's will nip the fins of your angels. Probably doing more damage. They are pretty
notorious for that. I personally wouldn't put the two together. Been my expereince..even though some people may say otherwise.
Dwarf gourami's are a bit more peaceful.
The cory's will be fine with the angels though.