You just changed the manifold and the first time you tried to start it you get the click? Sounds like a bad ground. Did you make sure the ground wire from the manifold to the body is good? As inadequate as it is, it needs to be there.
Man, this is a tough one. Have you jumped the starter relay? Key on, screwdriver connectinh the relay's + terminal and the (uncapped) screw terminal on the left, marked S. If that starts the starter yer problem is the relay but really that has no bearing on the new intake.