Trev,
http://www.speedwaymotors.com/p/3823,47_SandB-Chevy-Cast-Iron-Tru-Ram-Exhaust-Manifolds.html?itemNo=ram's%20horn
Check out these. In my opinion they offer the performance of headers, have great looks, are priced right and are cast iron.
If you do find a set of original rams horn's off a corvette with the 2-1/2 dump they will cost you at least this much...unless you get very lucky as a lot of rodders used these and most know their value. The much less popular 2" can be found all day long and are priced as such.
Hope this helps,
Dave
