Sounds like a great street head for my 340 (it's a street motor, looks like I might be selling my rpm heads). Now only if a dual plane intake is made, that would mean I'd be parting with more of my money. Let's see what gonna happen!!!!
Dude, it is NOT a good street head, especially for a small cube, 340, and then you want to put a dual plane manifold on it?!? That would be a total mismatch of parts and will run like crap. Keep your RPM heads.