Consider having a performance camshaft installed during your rebuild since you have it apart. Do some research on making it a stroker engine. See if that's your taste. It isn't something you can really reconsider once putting your engine back together. Id also consider matching new heads to your cam shaft , then get performance intake, and a performance carb on top of it. Make it breath right, then fire those plugs hotter and faster in better time with an electronic ignition system. Take some time doing research on all of those, see how they compliment each other, then figure out what you can spend.
---------- Post added at 11:26 PM ---------- Previous post was at 11:15 PM ----------
I've just recently educated myself on most of this stuff, and I'm having a shop build my engine as we speak. I'm having my stock 289 heads ported. And I'm having my block bored 60 over. It's already at 40. My mechanic is putting a camshaft in for me also. I have an old torker performance intake that I'll probably swap out for something newer. And I'll likely install a new carb.
I don't yet have a new distributor but it's certainly on the list. Let us know what you decide to go with