The Cobra, GT-40, and the Explorer all use the exact same GT-40 lower manifold. The only thing different is the upper, and as far as flow volume, they are almost identical.
You are running a combination very similar to the 1995 Cobra R. You should be deep into the 13's. I also agree your injectors being too big, but the 70mm T/B is okay since you are running a 351. What are the 351W heads off of? If they came off some crappy old 351 that is one of your problems.
Sell the Cobra/GT-40 setup, get a TFS manifold to replace it. Have the heads worked, or get some good aftermarket units. Add an aggressive cam combination.
If you are just trying to get by, change the cam so you know what's in it, and have the heads worked. The GT-40 setup on the Cobra R was restictive on that engine as well.
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