I am a little worried about detonation with the junk open chambers, but I'll deal with it until I can afford a set of Perf RPM heads, at which point I will have to pony up for some better gaskets in the .045-.050" thick range to keep the quench right. Though I'm tempted to leave it tight and see how it runs. Being a hyper piston and fairly tight piston to cylinder, I think .034" to .030" quench might work. Though I'll prolly chicken out and just run the thicker gaskets.
Were the manifolds all matched to the heads? This manifold is small in the runners and I'm expecting a happy medium between the RPM and something larger, like a victor or M1.