Best 318 heads
There's a difference between having them already or/and on a running motor and then just considering the swap without having them, as even cores at least.
When I say not to mess with them...I saying in the starting from scratch stand point because they aren't really better in the flow department VS COST, though they have a better chamber and an exh that can be made to flow more by even a monkey with a grinder.
Sorry to hijack, and just thought I'd give a fair shake