Out with the 340 & in with the 410 stroker!
How far did you go on the pushrod punch?
I took the brass sleeve out of the ones I am working on and epoxied in an aluminum dowel pin, I found some w2 rockers on ebay (thanks to tony), mocked them up and gonna have to use a short intake bolt by the intake pushrods, but should work fine. So now the intake port has a straight shot at the bowl, I also took the radius down at the area just above the combustion chamber water jacket (where the bottom of the port meets the bowl at the side without the pinch) evened it out with the head bolt bulge.
What brand valves are you using, stem size? Did you undercut them?
I found a place that will flow the heads for 50 bucks, so I will get you some numbers and pictures then. You got a flow bench, how much, where, pics?