dssur
+1y
cylinders 1 and 4 are at TDC at the same time, so are cylinders 2 and 3. The firing order is 1342, with a cylinder firing every 180 degrees of crank and the "linked" cylinders (at TDC simulataneously) fire every 360 and each cylinder by itself fires every 720 degrees.
It sounds to me like you just need to turn the crank 360 degrees, till the crank keyway points up again, and magically your distributor will point at #1.