weld it to be sure. another racer i know used some epoxy on a set of B1TS heads. the epoxy fell out & allowed the water to hydraulic the cylinder which in turn threw a leg outta bed. new mega block was trash & the head was severely cracked & distorted. the price to weld is waaaaay less than the price to replace all that gear. weld it!
not saying this is going to happen to you but the B1 boy didn't think this would happen to him. how lucky do you feel?