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

Alright, I went to the track yesterday and ran my car - the only word I can find to describe the performance is PATHETIC. I'm too embarrassed to even post what it is.

Clearly the two main things (besides the low compression and exhaust manifolds) holding my 318 back are the 2bbl carb and the oe cam.

I'm thinking like anyone else who's had one of these dogs - put a 4bbl carb and Edelbrock manifold on it to wake it up. These are time-honored bolt ons. They must be ok for something, no?

My question is this - is it actually worth doing with the wimpy stock cam?

Here's the thing. I AM NOT going to pull the engine. I know all about the pros and cons of 318 vs. 360, how they all grow on trees etc. Let's just say my only choice at the moment is to leave everything AS IS and the only thing I can do is to get a manifold and Holley 4bbl for the time being. Distributor is staying (points) exhaust manifolds are staying (though it does have a dual exhaust with an H pipe and Flowmasters) and oe cam is staying.

I'm thinking LD4B (they can be found fairly easily as far as I can tell) and Holley 80454 which if I'm not mistaken is a Mopar-specific 600 CFM carb. To me this would be the easiest and least expensive route. Those carbs new are like $180 or so. I figure this all adds up to around $350 - $400 bucks including all the misc. parts need to complete the job though I could be wrong either way.

In my little brain, I'm thinking there HAS to be a better induction path than the cast iron manifold and 2bbl carb. The low performance is killing me! I'm hoping the minumum of tinkering will net me some seat-of-the-pants satisfaction. I once had a 273 in a '67 Belvedere with basicallly a manifold and Holley carb. Ran OK.

Thoughts appreciated.

- Greg