Well this is a new-old topic which has been discussed before:

http://www.clubhotrod.com/t1036.html

Probably the "new" cast iron ram manifold is too new to have been tested, but I can answer my own question from the new Speedway catalog (Catalog 221) because on the same page showing the cast iron high arch ram manifold there is a stainless steel shorty-tight-fit header for exactly the same price! Tubular stainless steel should solve the problem of corrosion and offer the same performance as has been documented in many dyno tests. Still I guess some magazine can churn out an article where someone dyno tests the new cast iron ram manifold. For looks and the same price with known performance benefit it looks like I will go with the stainless steel tube headers. Thanks for listening.

Don Shillady
Retired Scientist/teen rodder