Please help / antifreeze leak

Small block; both heads, front and rear exhaust, are open into the water jacket. That is one of the reasons studs where installed at the factory (and makes it easier to install manifold by yourself.
It had sealer on the threads from the factory, not on the whole bolt, but just in the block. That is what they have to have. FACTORY. Maybe a Chebby guy was involved? lol. All 4 bolts need sealant in the block; rtv, teflon paste pipe dope, teflon tape... pipe dope or hi-temp red rtv is best.