Is there a way to reseal a leaking intake manifold?

Yeah, with a super charger, I think you'd best pull the intake and reseal it properly. Even with a good scavenger system for your crankcase, a patch might not hold. You're welcome to give it a try though. I've used spray carb cleaner to get the area clean and dry, then used RTV black to seal everything. It's worked great for me on regular induction engines. I haven't tried it on a turbo or super charged engine though.