I am not sure if this info will help you, but the stock heads on my 55' engine were the same. They both had all of the holes etc. on the ends, but one was just on backwards from the other. This engine had reverse flow cooling with the elbows on the ends of the heads going to the water pump. The left hand manifold also angled forward and looped under the oil pan to tie into the right hand before going back as single exhaust.
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