Edelbrock LD4B - what's the operating range?

Thanks for the info guys. I'm considering this intake for my 72 Coronet wagon. It will be set up as a cruiser so light-to-light performance isn't on my radar screen. Right now the car is a dead stock 318 2-barrel. I'm not distressed with the level of get-up-and-go it has currently - I could live with the present arrangement if I had to.

I'm guessing the car with me in it is somewhere around 4000 lbs. I believe the mileage is still the first time around at ~58K or so. I need to do another compression check but if it's good I'm fine with leaving the bottom end stock and working from there. If the bottom end needs help I'll have to evaluate the situation at that time to see about just boring over .030 or so, or going to a 390 stroker. I can kick that car far down the road for now however. The car runs great. :)

I doubt this car will ever see the far side of 4500-5000 RPM and likely a lot less. My plan is to pick up a set of loaded Speedmaster heads on Black Friday, add a smallish SFT cam (not much more than 224* at .050 and about .470 lift or so), a 4-barrel intake (carb likely a Street Demon 625 or a TQ 6139s). I'd prefer to keep exhaust manifolds for the factory look (maybe 340 HP versions?) but I'm not dead set against some long-tube headers. The end goal is whatever I can squeeze out of the car for mileage with improved performance as icing on the cake. Right now the car has 2.94 gears but I'm giving serious consideration to going to 3.91's with a 4-speed lockup OD trans. That combo will get me something like 2.8x gears on the highway and will move out quite a bit better.

Back to the intake question, with the above I'm looking at either an Edelbrock Performer (stated RPM range is idle-5K or so) or the LD4B. What says the forum gurus?