In defense of "It's Going To Take Some Time" - remember, Carole King's Tapestry was sort of the Thriller of its day....so covering it and releasing it as a single surely made a lot of sense at the time.....it's pretty mellow, but not out of place with so much on the radio in those days.....
"It's Going To Take Some Time" was on the follow-up to Tapestry, Music. The story I've heard is that Carole was recording at A&M and Richard stuck his head in the booth and heard her recording it...made sure that she didn't plan to use it as a single, and went to work on his own arrangement.
I think even Carole knew it was fairly lightweight. And she only issued one single from Music, "Sweet Seasons". My personal fave is the title track:
As for "It's Going To Take Some Time", my favorite version of that is actually an instrumental from Gabor Szabo in 1973: