W2 cylinder heads

A Performer RPM won't fit. Ports are different as well as in inside bolt holes. That intake would be a restriction anyway for the head's potential
There are dual plane W-2 heads out there, which may be cast iron. They pop up from time-to-time and were designed for circle track rules. Otherwise you'll be limited to a single plane, unless you do a lot of custom welding and cutting to get a conventional aluminum intake to fit, like they did when W-2's first came out.