You've probably seen these already but have a look here:

http://www.hotrod.com/how-to/engine/hrdp-0712-mopar-intake-manifold-comparo/
http://www.hotrod.com/how-to/engine/mopp-0207-intake-manifold-engine-and-rpm-range-test/

Of course it's only an indication and should be taken with a pinch of salt.
Personally I like the 8009, it fits well and is an improvement over the stock design. Easily available s/h too. YMMV.