checking for cracked head or bad head gasket..

There will always be water left in the intake because you can't drain it completely so your answer in NO that will not tell you.

You already have water/oil mix in your your whole engine since you stated you found it in the heads. That also means you have water in your oil pump, cam bearings, main bearings and rod bearings. Water can and will ruin the bearings pretty quick.

If all you want to do is replace the intake gaskets then it appears this thread is finished. Hopefully the 5th set of intake gaskets fixes your engine. I haven't read one post telling you that is what you need to do.