RE: Welcome to Club SAITO !
After reading Bill's excellent tutorials on this site I installed the stacks on my .56's and 72/s... Being the owner of a couple of .72's I am frequently replacing the O rings on the intake manifold... I use the old O-rings between the stack's and the carb when installing the stacks... Seems to be a real good fit... Haven't had any problems with them yet..
IC.. The gasket sets are not very expensive from Horizon...