Smallblock intake manifold shootout.

well you can break it down like this (assuming PRODUCTION heads):

Best Dual Plane Intake.. Edelbrock Performer RPM/RPM Air Gap
Best Single plane Intake.. Edelbrock Victor

Side Notes:
for dual plane the LD340 is a very good intake. and when you apply the mods as outlined in the mopar technical service bulletin its every bit as good as the RPM. not bad for a 35+ year old intake. for single planes the MIghty Holley Strip Dominator is/was an awesome intake.. that thing just flat out hauled anywhere in the rpm range right out of the box. Offy Port-O-Sonic tried to bridge the gap between single and dual plane intakes.. kinda along the same lines as what the Holley Street Dominator tried to do. For the "wow" factor you couldn't go wrong with Edelbrocks 340 6bbl intakes.. the 1000cfm didn't hurt anything either. for the double "wow" factor its tunnel ram all the way. those things scream "get outta my way". also the lonely 71-74 Stock Thermoquad intake is a very overlooked intake. those things make GOOD horsepower.. only downfall is they are as heavy as a couple of 24's.

the bottom line boils down to intended usage. all manifolds trade something off wether its bottom end grunt or high rpm horsepower. there is no such thing as a "perfect" carburated intake.