New head/intake gaskets. Yes the rad tool to see if it holds pressure. Some end rail gaskets are too thick & can hold the intake up a hair making one or both of the front cooling ports leak (use a wide carefully placed swath of silicone front & rear instead) & not sure if it's leaking in the front cooling port(s) & drifting rearward along the valley as seen in the pics or if it's one of the closer to the valley edges of the block deck. Not sure what to suggest on the integrity of the crosswind intake. You want this done once & for all & I'd take the block/heads to your machinist & see if they're flat then purchase some new gaskets then check the bolts/bolt holes & see what you need to do to have the intake checked out & button it up & pressure check it & cross your fingers. Holler how it goes. EDIT You could have the sides of the intake milled slightly to true them up & custom thicker gaskets may or may not then be required. You wouldn't know till you mocked up the intake/current intake gaskets on the long block & checked port/bolt alignment