gunk under intake manifold

Thanks for the tips and ideas, I want to spend as little as possible right now cause I just want to get it back on the road. I’m gonna carefully clean up what I can and see how it looks then.
The rust inside the intake manifold where the thermostat housing is...would it be best just to replace it with another 318 2bbl intake or is there a way to clean inside there and get it off?