School me on W2 heads.

You can get full rocker gear through Summitracing, Jegs, Manciniracing.
Just order the stuff as W2 specific to avoid any misunderstanding and possible wrong parts.
W2's will use W2 shafts.
W2 gear works on W5 heads FWIW.

On the basic laymans math on head flow vs. HP, it would be cfm X's 2 which slightly unrated the head but show realistic power potential in most aggressive combinations seeking to make very good power. Race engines exceed this basic math of cfm X's 2 for power.

The question of, "Is this head worth it." Is probably yes if your looking to hand out a pasting on the street or run very well at the track. This head far exceeds an OE heads power out out abilty. Typically exceeding 100HP gain.

The question here is the cost of the build. It is a little pricey, but your building for serious power gains over a stock head.

These iron heads have always been a popular step up until the aluminum W5 (More race than street) & then the inexpensive Edelbrock head (more street than race) of which both save approx. 50lbs. An attractive weight savings and trick look. The previously mention poor W5 castings make that head a bit unattractive for most and the Edelbrock head is very popular allowing a little higher compression and near dead on similar performance. The fall a little short in Max cfm flow most times.

Here is another way to look at it.

Hey rumblefish, would you use them?
Me; Yes indeed. Plans are in the works currently. It should make for a powerful VERY long lasting street machine. Rock solid heads.