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I totally agree. I'm realizing just now that (probably) I've a Victor jr single plane manifold.
But getting a Performer dual plane is too much "invasive" for the moment... I guess more easy to work on the carb tuning. I'm checking if I've a vacuum secondary or not.
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If your running a Victor Jr. intake, that is going to kill your off idle/low end responce quite a bit...You may check around and find someone looking for a Victor Jr. intake and swap him for the Performer RPM... On my 65 Fastback, 351-W, about 350hp, I'm running a Performer RPM intake and a 20+ year old Holley 600 double pumper and if you stand on the throttle from idle (800rpms) it will haul the mail thru 5500 rpms with no hesitation....
On the other end, I'm running a Victor Jr. intake on my race car (331 stroker,13.3 to 1 compression), it never sees less than 3500 rpms under race conditions and I run it up to the 7000 rpm rev limiter.....
The MSD ignition is a definte upgrade to any stock ignition set-up,but I don't think you'll see any performance difference with it in your current set-up.....
Your Demon carb is a very good carb and sized right for the 351-W, maybe changing your jetting might help a little, but I think your biggest problem is the intake....
David