[blykins]

It kinda depends on the size of the engine too. For an example, a Super Victor intake would make a 289 behave a lot differently than a 363ci Dart based stroker. In the same token, 185cc heads on a 302 would be a different story than 185cc heads on a 347.

When selecting a head, it's best to aim for the highest flow with the smallest port volume. This helps keep the velocity up.

Due to the light weight, a Cobra can get away with a little more radical-ness than the normal street rod. Cams can be a little bigger, heads can be a little bigger, etc.

AFR 185's run absolutely great on a 331/347 though. The AFR heads have great low/mid lift flow as well as the peak lift flow. They really make a good product and I use them every chance I get.