I have an Edelbrock CH4B in my 68 Sedan. This is an older manifold, but very similar to the performer (I have read that its tuned for higher rpm more than the performer is, but it still is dual plane, and it still is somewhat taller than the stock. I am using the stock air cleaner, which gets very close to the hood. The hood insulation is a bit "crushed" where the interferance is. But the hood closes without extra force. I suspect the hood level of the 67-68s and the 64-66's may not be identical, but the 67-68 hood is more likely to be lower than the 64-66. Which means that if it will fit in my 68, it will most likely fit in your 64-66. D^2 Quoting bob siliani <bsiliani@xxxxxxxxx>: > I was wondering if anyone has put a dual plane intake manifold (like a > Edelbrock Performer 5" rise) on their Imperial with the 440 wedge motor. > I > will be putting it in a 64-66 model and don't know if there will bee > issues of hood clearance. I always can use a different air filter but > still don't know if I will have problems. Can anyone take a qiuck > measurement? I will not be able to till next week. >