Leaky 400 RB... Any suggestions???

I had a 400 that my radiator cap stuck on - While towing up the approach to the Tappan Zee brodge... the radiator exploded, blew the open element out of my air cleaner, shut the engine off, bent the hood hinges, and bent the radiator around the fan. the combination of presure drop and excessive heat (gage did not work as it turns out...) instantly boiled out all the coolant from the engine - only fluid left was in the heater core. I had to swap the entire cooling system (radiator, water pump and housing, coolant and water included) from my race car into the truck on the side of the road. That engine went on to run for 4 more years and is now a 500" stroker. The heads and block were fine, it never seaped a drop. But, the ring seal suffered and it started to use oil after that. They are really tough engines...
Normally exh seepage will seal itself. Which is why I say unless it was rebuilt or done it since day one, it's probably not the studs. But, a little time spent can't really hurt at this point.