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One very good alternative is the "tunnel wedge" intake. It is a single plane unit made near the end of the FE run. It offers a fairly good bottom end with the look and near flow characteristics of the tunnel port unit.
The real factor is heads. You will want to very closely match any intake you choose to the heads you have or will have. Getting a mismatch at the point the heads meet the intake is a huge power loss.
All the intake manifolds on the link I included are a perfect match for Edelbrocks heads. Dove is another company that makes heads / intakes which are an exact fit.
The importance of this can be found in the "parts for sale" section of this fourm. An engine builder named Kieth Craft has an FE engine for sale that made 650 horsepower and 555 ft pounds of torque. He did this by extensive porting, but more inportantly it was the flow characteristics of the porting and the smooth even (volume of the runners after porting) way the air flows.
If he reads this I have no first hand knowledge of his technique, it's an art as much as a science. It's what winning racers have known for decades, just know that it makes a huge difference.
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michael
A man that is young in years, may be old in hours, if he have lost no time. But that happeneth rarely. Generally, youth is like the first cogitations, not so wise as the second. For there is a youth in thoughts, as well as in ages... Sir Francis Bacon (1561-1626)
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