383 Engine questions

moparmade43,
The cam is a comp cams cam and it is .480 lift and 230 @ .050 280 adv. dur., it will work with stock steel rockers. Adjustable rockers are always better, but this means that you have to change the pushrods also. Your thoughts on the intake is right on, and as for the valves and wanting low rpm Tq. and Hp then I would stay with the stock size valves and bowl port the heads and do a good multi angle valve job, as the smaller valves will make the engine respond better and they will make more Tq. and low end Hp than the larger valves, and your not going to be racing this engine or car so the large valves wont help you if any at all. The velocity will be better with the smaller valves and the higher the velocity the more Tq the engine will make, and this is what you said you were after, also it still will be stock and not just appearing. Larger valves generally work better above 6000 rpm's and this is somewhere that your not planning on going. Most of your time will be spent at about 2500-3000 rpms which is highway speeds.
My next choice would be the M-1 dual plane as it works very well too. And there a bit cheaper than the Edlebrock manifolds.