Need help and advice (Intake and carb swap)

1974 318 two barrel, I'm swapping to an Edlebrock Performer with an edlebrock 1406 elec choke. stock 318, with true dual exhaust/flowmasters.

I pulled off the stock two barrel and manifold. The valley has quite a bit of carbon in it. Should I chip it out of there, clean it with a spray cleaner, or leave it alone?

I went down to the local parts store and bought stock intake manifold gaskets. They are metal. With these cause any issues with the aluminum intake?

Can you offer advice on installing the intake. (IE where and how much sealant, torque specs, and any order). Lastly any suggestions on what I need to plug after this install and what throttle linkage to get, if any.

I've never done an intake swap and I'm a little nervous. Any help would be greatly appreciated. Also thoughts on how much HP this combo should put out compared to what it was stock. Thanks a bunch, Troy