318 2bbl manifold swap with OE cam - worth it?

If it were me, I'd do a good dual exh system off the manifolds and upgrade the ignition first. Then see how it responds to that. IMO, there's no reason to really add intake and carb when the rest of the system is not even performance oriented. I did it on my first car... stock iron intake, holley 3310 750VS on an adaptor, and single exhaust witha sonic turbo muffler. It was a turd. I loved it, and I learned a ton from it. But it was a turd. Knowing what I know now, I'd kep the stock intake tract and work on the exh side and ignition first. I'd bet you get more power with less monkeying, and the next $250 can go into a used 318 performer intake and 600 carb. At least then it's ready. The cam will wait. the rear can be done any tiem with great benefit too. the valve springs become your own rev limiter...lol.