The factory "long rams" were tuned for peak torque in the 3000rpm range, unless the port dividers were shortened (either cast that way or by cutting them apart, shortening the divider, and then welding it all back together). Needed in the days of "two lane blacktop" passing of slower vehicles. About another 30 lbs/ft of torque on a normal 413?
As good as the 2x4bbls might have looked, later 1x4bbl manifolds would make as much power with few problems. If you want a "WOW" factor, then get some chrome valve covers, polish the valley pan gasket, and other polished chrome stuff under the hood. THEN cover all of the rubber lines in the plastic sheathing, in some eye-popping color (like Panther Pink, Limelight, or InViolet).
By observation, so many of the "fancy induction system" cars at the weekend cruises do not live up to their visual impact billing. Won't scatter crap, usually, either. There's a reason you never see them at the drag strip. Not tuned correctly, but tuned to the specs that some "guru" said to use. End result is, a mis-matched carb/cam/cyl head/exhaust/torque converter/rear axle ratio car that looks better than it will ever perform. Usually sold quicker than it should be, usually. Find one that works and you'll probably find an owner that know how to keep it running well. AND knows how to change Holley power valves and/or read spark plugs!
Just some thoughts,
CBODY67