middle thereabouts will do nicely
remember and use correct timing mark on bottom pulley[the lump]
-looking through the dizzy drive there is a pointer arrow on the drive sprocket-i assume you are using that
turn it over twice by hand it may well line up better with belt settled-and you can check for interference
https://www.google.co.uk/url?sa=t&rc...oZ9yzxZIh254zA