i've never worked with that one, but does it come with the 70cc hi comp head? in the picture in the wiki it does . . . if so, awesome!
i have a 19mm dellorto PHBG on a 65cc metrakit with a hi comp head and it has a 103 main jet and a 52 pilot jet for break-in. i can't tell if the needle's a 6 or a 9 (dellorto logo's smudged so i can't tell which way is up) but 6 is too thin and 9 is too fat from what i hear; what you want is a 7 or an 8. i hope that helps? really jetting is so variable . . . i think out west on my same set-up people are running the kits with jets 5 or 6 sizes bigger than mine, and that's on bikes that are already broken in.
you know, in real-bike-land jets are sold in sets of 25. they come in a little plastic case like an angler's lure box with the numbers printed on the doors. but hey, maybe somebody who knows what he's talking about will chime in who's using your exact same kit and carb who lives in your geographic area who's willing to say exactly what jets he's using . . . and then you'll only have to buy 10 of them!