I'm sure XD will have some good advice for you. I think he runs a set of AFD 2V's on his motor.
Personally I think you might find you'd have to put about 12 - $1500 US in your stock 2V heads to get them set for a "solid" street build.
It's pretty well known that the stock 2 piece valves are a liability to a C. They pop heads off and or sink the valve keepers under high revs. Either case means a shattered piston and possibly a cracked block. Next are the guides, studs, guide plates, springs, retainers and all the machining to go with it. You might be encouraged to go with larger valves which adds to the pocket machine work on the heads. All in all, lot's of parts and labor.
There are several very good aftermarket heads available from CHI, AFD, and even Edelbrock here in the US. They all run about $2000 (complete) with valves, hardened seats for unleaded, springs, guide plates etc. They are aluminum heads also which saves quite a bit of weight.
In any event you will still have the added cost of cam, lifters, intake, push rods, rockers, carb etc. At least another $2000.
Is the bottom end solid? Was the rebuild just stock, cast pistons, std oil pump etc? Nothing wrong there if it is, it just means you would want to stay with a hyd cam if you aren't going to tear down to put the oil restrictors above the mains. (they limit the oil to the cam bearings and force more to the rear mains).
The intake you choose should be determined by the heads and the cam. Again, lots of very good aftermarket stuff available.
CHI makes an intake to suit there heads. Very good choice from what I hear.
XD, do you know of AFD makes one also?
If you go the Edelbrocks, the RPM AirGap would be the goods. (I haven't heard terrific results with the Edelbrocks though) Pricey and may not perform to CHI or AFD out of box.
Just MHO. You are sure to get more.