'36 221 - rebuildable??

[40coe]

Great to see your LB engine coming together. I have built a couple of those for myself. I do believe that the valve angle is different from left verses right. This is why the heads are different casting numbers. I agree with a previous post suggesting to "cc" them on the block.
Another note, it is common for the center web for crankshaft to crack along the oil port. I stop drilled mine and put a thin sleeve in the oil port.