For my 2 cents, grab that Edelbrock carburetor, rear back and sling it as hard as you can against a wall! chuckle It's just an ancient Carter AFB reborn into a still mundane fuel mixer, with all the headaches of the original AFB. A 600 cfm #1850 Holley is ideal from my experience and a lot easier to tune. If your Edelbrock intake is dual-plane it will be fine--an engine as mild as yours doesn't need a single-plane intake. As for headers, any will be fine as long as you stay with 1-5/8" tubes. Summit headers are great and well worth it. I've found that a 350 with around 9:1 compression, stock pocket-ported #462 heads, a 268-degree cam, Edelbrock Performer intake and a 600 Holley will make around 325-350hp if tuned right. It's a fun, peppy engine that will put your car well into the 14s in the 1/4-mile--that's real life, not magazine numbers.
Anything over 350hp is on an entirely different level with a 350. Good luck!