i can tell you now thats not off a 4A of any kind..definitly know it's not a 4age..and a 4AC is a non cross flow engine, so the inlet looks similar to an 18RC
IeeIIeeI (I = inlet, e = exhaust port) and the fact that it has a coolant port between 2 of them..maybe it was off a 2T Levin? the older shape TE corolla, they have a single cam 1.6 cross flow that looks very similar to that..
hope this helps..maybe a trip down to repco, and ask to see some inlet manifold gasket pics for 70's and 80's toyota 4 cylinders..?