Brian:
Knowing which air grabber base you have (originally for 383 or 440, as they're different)will help answer your original question as to which manifold will help you "on my 70RR to clear air grabber". The 440 base is shorter than the 383 base because the intake and carb sits higher on the 440 than it does on the 383. I understand it is really close running a 383 air cleaner base on a stock 440 manifold so running a taller manifold and a 383 air cleaner base may result in hood clearance problems. Some of the guys here can tell you the difference in height on the 383 and 440 air cleaner bases, I'm thinking it's around 3/4 inch. RR's weren't available with a 4 bbl 440 but GTX's were, however it makes the bases hard to find (=$). I don't have a stock cast iron manifold to measure to compare to the above measurements but if you can find a manifold that is actually LOWER than the stock cast iron one by 1/2-3/4 inch you may be able to use your 383 base.
(Understand that to do this you will be giving up some top end hp by not using a better (taller) manifold design, but if you have to chose between the air grabber and the intake.....that's your decision.)

jt

if your 440 is less than 9.0:1 and 224 deg @ .050 intake duration, your best bet is a Performer style. If you choose the Weiand Action + 8009 . It will make more tork similar to the TQ of a CH4B, and look the same. Yet, the top end will run out around 4,800 rpm. The actual Performer will get you good through 5-5200 rpms, making its torque peak a little latter than a CH. The Performer has more plenum volume than the Action + to account for this.

Some people say the runner length is to small on the low DP's and a RPM high rise must be used on a 440.

FYI-Rpm Mani's can be shaved 1/4" for clearance on a dual scoop hood.

Over 224 duration w/3.23's and lets recommend the RPM intake for street use. The RPM can take more radical camshaft than a open dominator intake.

At the track w/ 4.10's the dominator is the good one.

I have the 440 intake base! Had to look long time to find one.Its about 3/4 inch lower but I beleve I will still have a clearence problem. I don't mind geving up alittle top end to run the air grabber just want to get right manifold the first time.