Pat and Richard (techinspector1) I would say are the resident experts (what ever happened to erik?). But I'll take a stab... How fast do you want to go? (read how much $$$$ you willing to spend?)

I plugged in your specs to desktop dyno and dragsim and it looks like you are running out of gear at the top end (around 1000')... would you agree?

Carb -> Either 950cfm Holley 4150HP (or similar) or 1050cfm dominator (or similar)... the 1050 will give you about +10hp over the 950

Heads -> Move up to rect port... pat will have best suggestion but I think Brodix BB2 Xtra 365cc will be good

Cam -> Comp XR286R .653/.660 248/254 @ 0.050 110 LSA solid roller (or similar)... we need to keep duration kind of low to make up for your low CR...

Intake -> Super Victor will work nicely but there are other more spendy single plane rect ports that may perform better....

Torque convertor -> 4000 stall (flash) is perfect for this combo... you'll want foot brake stall up to 3500

Tire -> go up to a 28" tire or you'll still be running out of gear at the top

If you stick with your oval heads you're leaving about 50hp on the table...

So here is what dragsim says:

Your current setup: 11.25 @ 117.5 1.658 60'
My suggested combo: 10.21 @ 134.3 1.509 60'

As for HP numbers:

before: 478hp @ 5500, 539tq @ 4000
after: 655hp @ 6000, 631tq @ 4500

Of course this is desktop dyno and won't be exact real world but I think reasonably close... you should expect mid 10's with this combo.

What are you running for a rear-end? I'm thinking your th-350 will be borderline and a 10-bolt would be too....

If you do all the work yourself, I think you're looking at ~$5k

My two cents and as said there are much smarter folks than me on here so there will be other suggestions...

-Chris