i did put a 272 top end on a 630 super 1st generation and i had to cut the top cover to allow the spark plug cap to fit in there. maybe a 630 super 2 have more space...
That's correct. If you take a close look at the pics of my two saws, you'll notice a slight difference in the air filter/plug covers. Plus the II cylinder cover is a bit taller due to the taller muffler.