I know what you're talking about too, we sung it alot at my old church in the 80's. Everytime that song was sung it brought down the house so-to-speak. The one I'm thinking of (and no, it's not the Eddie James version that was in the late 90's) has a solo part in it. The song starts off slow, then once it gets to the "Surely" part it gets a little faster. I know it was sung acapella and also w/ music.
All I can remember off the top of my head is the ending goes...
Amen, Amen, Amen....
Amen, Amen, Amen, Amen.
and it repeats over and over until you end the song.
I don't know who recorded it though, sorry.