The lights work on all three Rupps i posted. I make my own wiring harness for them, as the originals are always junk.
And yes the Dellorto helps a lot. On the 1969 and 1970 I have a Dellorto Ua18. On the 1972 there's a Dellorto Ua19 (as used on a black widow.) I can't really tell the difference (though they look/mount differently.) But they for sure give better performance. But mostly they just look cool!