I've got those Billy Eckstine albums on file. They are ok. I don't think it's "great" though.

I don't think Eckstine would have been great shakes at Philadelphia International. Eckstine was past his vocal prime in the '70s. Unlike a lot of singers from that generation, Eckstine seemed to not jibe well with newer arranging songs and popular songs of the day.

Oddly enough Arthur Prysock recorded in Philly in the late '70s and was "ok...."