Many production engines have angled rockers with the valve stems rotated in 2 planes (and intake & exhaust not parallel): BBC, Ford Cleveland/Boss, Ford 385, Chrysler polyspheric. The 235 has valves parallel in the crank axis plane, but not parallel across the head.
Maybe this was posted earlier: are the valve stems parallel to each other? I assume they're at an angle to the bore axis (so are the stock 292 etc. heads, but perhaps not the same angle).
