Beware of one major Hemi-problem, that the rockers sometimes do not line up well and try to push the valvestems away. (Too short, and wrong geometry) This, along with coarse finish on the valvestems can eat the guides after a short while. And the MP alu heads have valvestem clearances same as iron heads, way more than needed on alu heads. When building a Hemi you need special attention to the heads, or you will get an oilburner....
So could the problem be isolated to the heads? Leak down, compression tests all look good. No blow by that I can see. The glass catch can between the PVC and intake never collected oil?
