i'd go with the CL712121-12 or CL718001-09
the -12 is hotter than a stock 340 4spd cam and the -09 is even more so, but the duration numbers are strikingly similar. i'd shy away from running .500+ lift on the street in a daily because you're going to need gears and a converter.
my pick would be the -12 if you're keeping the 3.23's and with the headers you'll probably pick up a bit of midrange torque. spot on carb size for street daily. that manifold will run pretty much neck and neck with an aftermarket with a mild combo (smaller, more reasonable cam, carb and decent compression). you *might* see some better low and midrange numbers and driveability with an aftermarket, but you'd be hard pressed to feel it in the seat of your pants.