360 stock intake manifold on a stock 318?

If you can get the stock 4bbl intake cheap, buy it.
They will work.
FYI I have a LD4B on my old farm truck with a 625 Demon and it was night and day difference between the BBD 2b.
Also the BBD 2b was rebuilt by me and ran excellent.

4bbl just made a huge difference, no other changes.