Help needed with sb 318

On the intake manifold......I am assuming it is stock....what came on the replacement engine.....and I may be about to show my ignorance.....but I assume that the manifold is specific to carb type? As in can't mount up a 2 barrel on a manifold intended for a 4 barrel?

Also keep in mind......while I have some basic tools and understanding of all this....but I'm not a mechanic. I can swap out plugs (and know enough to check the gap them.......but don't know what the gap should be).....but don't have other diagnostic tools. Don't have a compression gauge....vacuum gauge or even a timing light. Souped up shade tree guy down the road does, so he may be the one to test all this. I was hoping to pick off the easy stuff first.

As for all the rest, good to keep all that in the back of my mind if something easy doesn't show up first.

One thing I ought to mention.......when the beast showed up here.....it came with the original 75 gallon steel gas tank......including old fuel, rust and water. I took that off and replaced it with a 20 gallon aluminum fuel cell. Also replaced all fuel lines and filters. The old tank had an electric fuel pump pulling from the tank, then sending fuel on to the mechanical pump on the engine. We deleted the electric pump when swapped out the tank. Since she starts and runs.......and will crank up to high rpm's.......fuel pump does not seem to be the issue....but could be wrong about that.