Aluminum Intake Heat Crossover

..If you have a hot wrench with a brazing tip you should be able to melt some Zinc...
Lol, The Duro-wal wire outfit with their zinc coating tank left along time ago here. Helped dad do some "hot-dip" galvanize production over a couple weekends in my HS days. Whats the cost on a brick of zinc these days?

How rare is the intake, may be time to look for a replacement?
Not rare , just an old CH4B I wanted to use short term as cheap as I can.

Is that a hole above the crack?
Looks like that's there on purpose, not sure for why.

Why don't you just cut the bottom out of it, weld up the ends and move on ?
That would be best, and slicing the bottom would easy enough. The I could see any crack I guess.
I'm surely not a welder of aluminum. When it comes to that, I can cut but not paste. I'd have to run it over to my "bow tie" brother to weld. He loves to rib me when he gets the chance.