Forget all the answers above, each leaning towards their own tilt.
Your car is a Polara, it's a C-body meaning it has room under the hood.
Absolutely the best intake manifold for your engine is the Edelbrock Performer RPM. No other intake need apply for a stock road-driven 383. Period.
Absolutely the best carburetor for your engine is a Holley Street Demon 650 with the space-age plastic body, Part Number 1901. It works right out of the box, like a brand new carburetor should. Plus it looks like it belongs under the hood of a Chrysler.
The Street Demon is the modernized version of the Thermoquad, which was the most advanced carburetor of its day. The Street Demon is the latest carb to roll out of Holley and it is the most modern American made carb on the road today.
Do it this way and the results will be surprising. PM me if you want to talk some more.
R.
