Man 440 is a wide beast. Neighbor has one in his 67 Satellite (GTX Clone) You can setup camp on the intake.
I have the RPM Air-Gap, I have run several before (have not installed mine on the 360 yet) but it has a nice pull from 1500-6500. When swapping from a Performer to the RPM or RPM AirGap I found the bottom end TQ to feel the same at least no noticeable loss in seat of pants feel but the power from 2300 up was vastly stronger. The RPM Air Gap is still a dual plane intake it just offers a lot more cross sectional area and plenum with a better shot at the valves. IMHO is one of the best intakes ever made for the street. I have run them on 383 strokers (SBC) that were 450-610hp depending on the head/cam combos, and have one on the built motor in the olds 442. I would avoid a single plane at all cost in a big heavy Jeep. A victor Jr for example will come on hard above 3500 but for any normal driving on the street my wagon is shifting around 2500. As rock mentioned a compression bump = an awesome gain in performance and efficiency provided to map the spark accordingly. I will be installing a fairly warm cam in mine with a compression bump to offset overlap. (DCR will be low enough to run street fuel fine) and using a Holley HP 750 for my initial setup until I build out the injection system later. Based on my past experience with the cam profile/intake/ compression this engine should make very good street power up to 5k. Just my .02 well see how it all works when I finally get it built. ROFL
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06-Corvette z51-6spd,b&b,K&N low miles.
77-Corvette Stingray 496 BBC/TH400 built 667hp+
00 WJ 4x4, 4.7 stroker, turbocharged,..lots more..
01 WJ 4x2 4.7v8 Limited (needs valve job)
90 Grand Wagoneer 401 Edelbrock Heads, Lunati .510/.527 FT Cam, Edelbrock RPM Air Gap, Holley HP 750, Thorley Headers, HEI, Electric Fan w Digital controller,4" lift 31x10.50 Goodyear Duratrac's on Pro-Comp Wheels,new interior, seats,seals,Alpine and JL full system, Remote HEI, Clifford 2 way with remote start,windows,tailgate.
96 Cherokee Country 4dr/2x2 White/Tan 3" Lift Sahara 18" Wheels 32.5"'s 99up head and intake- for sale soon!