I run the Price setup and have had many communications with Bill and Mary regarding their product during the development stages because I had previously modified an Offenhauser intake to accept dual carbs.
In my opinion, the Price 351W intake is exceptional. There is a lot to say since Edelbrock also makes a 351W dual quad intake now but there are notable differences between the two products. First, the Edelbrock intake will only accept Edelbrock or Carter AFB type carbs, no Holleys whatsoever. Now let's talk about the Price intake. First, the intake comes in two styles, with and without the 4* power angle. Most Cobra motors are installed without the power angle so you would probably choose the "flat" version. You can use Holley 4160 carbs such as the 390 cfm vacuum secondary model (which is what I use) or Price sells a 450 cfm carb that work well. Edelbrock or Carter carbs will also work but just don't look right because of the carb spacing. The carb spacing will allow use of the oval COBRA dual quad air cleaner for the FE motor as well as the stock dual quad FE linkage for the medium riser intake. You can run the carbs reversed like the original FE 427 or facing forward like on the original 289 dual quad setup. Check the Price web page for photos.
The workmanship on the intake itself is superb. Mary Price personally does all the machining work. My unit was flawless. If you are running a 351W block with the 9.5" deck height the intake should install easily. If you are running an early block with the 9.480 deck like I do there may be a very minor modification required to the intake which Mary might be willing to do if you ask her nicely. If you require more info about the modification for the short deck height please read
http://home.comcast.net/~superhart/cobra6.htm for the full story about my installation. Lastly, if you choose to run the carbs reversed there will probably be minor interference between the #4 intake runner and the universal throttle arm of the rear carb. This interference is easily remedied by using 1/2" phenolic carb spacers available either from Price Motorsports or Mr. Gasket. I performed a little surgery on the throttle arms of my carbs to solve the problem another way which is also demonstrated on my Build Page #6. The Prices also offer an original looking dual quad fuel log that fits the intake and resembles the original FE item. I am attaching a couple of photos of my setup. Total cost for me was less than $1100, much cheaper than a Weber setup. In addition, the setup just looks way cool.
In my opinion again, I believe this intake to be well worth the cost. Being a low riser dual plane design provides adequate hood clearance and crisp throttle response. Please remember that this is a good street performing intake. There are better choices for racing applications. Using the 390 cfm Holleys gives more than enough CFMs of air flow for even stroker motors while the vacuum secondaries avoid that annoying bog when doing a banzai run. I saw no change in gas mileage with the Price intake although, I must admit, I never cared about that anyway. I know some guys like mechanical secondary Holleys but I really don't see any advantage to them over the vacuum models in any application other than full race. Mileage will be better with the vacuum secondaries. As far as vacuum secondary springs, I run a mild cam with good vacuum signal and found the stock spring to give the best performance. Whatever carbs you use, be certain to use the diaphragm covers with balance tube designed for dual quad applications (Holley part # 20-28 or 20-73). Any questions, give a holler.
