The cross harp version is the easiest, imo:
http://www.harptabs.com/song.php?ID=16190
And the straight harp isn't bad either:
http://www.harptabs.com/song.php?ID=16189
But here's the slant harp version if you'd rather have a challenge.
-3”-3 -3” -4 -4 -4 -4 -3” -3 -3” -4 -4 -4
I-I could ride around the world in an old oxcart
-3” -4 -4 -4 -4 -4 -3” -3 -3” 4 -3” -3 -3”
And never let another gi-rl thri-ll my heart
CHORUS:
-3” -3 -3” -4 -4 -4 -3 -4 -3
Ain't tha-t loving yo-u baby? (x3)
-4 -4 -4 -3” -3 -4
Ain't that loving you so?
-3”-3 -3” -4 -4 -4 -4 -3” -3” -3 -3” -4 -4 -4
I-I could meet a hundred girls and have-uh loads of fun
-3” -4 -4 -4 -4 -4 -3” -3 4 -3” -3 -3”
My huggin' and my kissin' belongs to just one
(REPEAT CHORUS)
-3”-3 -3” -4 -4 -4 -3” -3 -3” -4 -4 -4
I-f you gave me nine lives like a tommy cat
-3” -4 -4 -4 -4 -4 -3” -3 -3” 4 -3” -3 -3”
I'd give 'em all to you and never ta-ke one back
(REPEAT CHORUS)
-3” -3 -3” -4-4 -4 -4 -3” -3 -3” -4 -4 -4 -4
I'm putting on my Sunday suit and I’m goin' downtown
-3” -3 -3” -4 -4 -4 -4 -3” -3 -3” 4 -3” -3 -3”
But I’ll be kissin' your lips before the su-n goes down
-3” -3 -3” -4 -4 -4 -3 -4 -3
Ain't tha-t loving yo-u baby? (x2)
-3” -3 -3” 5 5 -4’ -3” -3
Ain't tha-t loving you baby?
-5 5 5 -4 -4 -4
Ain't that loving you so?