What would be better?

My 2 cents:
Stay with a conservative dual plane intake because of the small, mild 318: LD4B, Performer, etc. Some of the more popular intakes have bigger ports than the 318 heads so the air flow will run into a lip/ridge in the port.

Not really sure about a carb. I always worked on Holleys, but mainly race tune-ups. Others have had good luck with Carter and Edelbrock on the street too. You have to make sure the kickdown linkage is adjusted correctly when going to a 4 barrel and that the carb has the correct brackets/hook-ups. Stay with a vacuum secondary carb, smaller than a 750. Don't get too carried away because you'll need to save your money for the stroker you plan to get!

TTI headers will work well with both applications. I have the 1 5/8"-1 3/4" step headers on my race car, so they should be good with more cubes on the street also. There have been many long debates on several forums about the cost of TTI headers vs. their benefits. But they are, debatably, the best fitting, best ground clearance and easiest to install headers available. You don't need a 90* oil filter adapter and they clear Milodon oil pans. You'll have to decide for yourself.

www.ttiexhaust.com