yall are slow... he said its a cast iron manifold

its probably a log style or one of the other cast ones (below), there never usually is a big collector piece on cast iron manifolds...

its fine dude you can run it,

it looks like this, right?:



tons of people use that style, of course its not the best out there, but it'll work... when the wastegate opens exhaust from ALL cyls will leave from the WG to avoid the turbo, the path of least resistance. you'll be fine.