Yes you can get it resealed with the intake on.
I would get it up on #1 on compression at TDC and pull out the distributor so you can get in there and work. Put a mark on your intake manifold to where the Rotor is pointing so you will have it back in time when you put it back together.
Like I say if you can get in there and cut out some of the RTV with a razor blade, then the new RTV has a shelf to sit on and help hold it in there.
Definitely need to do a quick spray with brake parts cleaner and compressed air once you cut out some of the old RTV to remove any oil film that got through. Don't leave the Brake Parts Cleaner on very long as it actually dissolves the RTV. The new RTV will stick to the old then.
Sometimes have to be creative with tools like an extension on a wire wheel so you can reach down in there and grind out some of that old RTV as an alternate way of prepping it for the next application.
Can weld on a length of 1/4" brake tube to the wire wheel for added reach. Shove a wrag in the distributor hole to keep debris out or tape it closed.
Small mirrors work good for looking in there to see what you are doing.
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