water bypass problem, need help

[dbmx66]

its for on and sbc. the problem is that i got my hands on and edlebrock cnc ported victor jr manifold. and where you would plug the 2 water bypass hoses into the back of the manifold. the problem is when i look down the holes, the manifold gaskets are not open there, like they block the port off, is there anyway i can cut them out? or am i stuck taking the whole thing apart and getting new gaskets that have them cut out already? i would just cut them out, but i dont want pieces of gaskets to fall down in. whats ur opinion? thanks