1965 Barracuda with a 360...intake suggestions?

To recomend a top and engine package, tell me/us what gears you have in the rear, tire size as well please and the goal being sought. Headers or not.

Mild upgrades, street machine nasty?

In general, I would look at a complete kit from a cam manufacturer like Crane/comp or a MoPar house like Hughes/Mancini. Get it all. Cam, lifters, springs locks retainers.

On a intake and carb, for the most part a 600 for regular to a bit of spirted driving, another 50 cfm for a powerful street engine will do well. The intake should be in the rpm range of the cam.
Example;
Low rise dual plane for mello cams/engine builds
Highe rise dual planes for more rocken engines.