In response to Dennis, all I can say is I think the boots have shrunk with time, so there is more room than there would be with new boots. My solution was to go to the hardware store and buy o-rings for each boot that are about 3/16" in diameter width-wise and fit the circumference of the boot flange exactly. Nice tight fit. Then I attached the boots to carbs, then heaved a little to mount the airbox. Definitely tighter than before and I'm hoping no air leaks, but I haven't had a chance to fire it up (dead battery at the moment). Are there any suggestions to check for air leaks? At this point I'm assuming the carbs will show it (cylinders running lean, hard to balance, etc).