ATSC standards are a set of standards developed by the Advanced Television Systems Committee for digital television transmission over terrestrial, cable, and satellite networks. (NTSC was the old system for over the air)
8VSB is the modulation method used for broadcast in the ATSC digital television standard. 8VSB is an 8-level vestigial sideband modulation...this is good for HD over the air broadcast.
QAM is the type of modulation that most cable providers in the US use. More efficient and can be used to inexpensively encrypt the signal. Clear QAM is a non-encrypted signal.
ALL Good. Go for it!