As was mentioned, according to Butler, the Inline Tube color is what they think is best, and the Duplicolor is their second choice.
I went with the Bill Hirsch initially and I did not like it at all. The Duplicolor DE1616 looks much, much better to me. I got it from Summit a few weeks ago but it's not available now.
Hirsch:
DE1616:
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70 TA, 467 cid IAII, Edelbrock D-port heads, 9.94:1, Butler HR 236/242 @ .050, 520/540 lift, 112 LSA, Ray Klemm calibrated Q-jet, TKX (2.87 1st/.81 OD), 3.31 rear
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