HELP!!! COOLANT WATERFALL!!

Before i knew any better, my brother did this on a 302. I said i dont think you are doing it right. He pretty much told me to piss off. 3 times he changed head gasket thinking it was leaking, but it was intake gasket.
Blew it up on the way to the lake.
Oooooo ouch. My other dart i had was a slant. I was losing coolant. Now, i will admit i get ahead of myself. My brain doesnt always tick right. But i do have extensive knowledge... and i dont know why i would thought that changing the head gaskets and rad, would not cause an oil pressure loss. I thought i needed a motor rebuild.....bought new motor and installed..... the only problem with the old motor was i hadnt torqued correctly. So sometimes i overthink, sometimes i underthink, and sometimes i just dont know. Im glad you guys are all here to help :thumbsup::thankyou: