great job on not swapping the engine, I see that you had the head face milled down. I would suggest you remove the exhaust manifold studs and use a flat sander to smooth all the ports down so they lie in a flat plane, then check the exhaust manifold and smooth that down too so its tightened evenly and wont warp the head and blow the gasket due to uneven cooling. Also knock out every single welch plug (block tikli) and also the one in the cylinder head and the intake manifold. And replace them with new parts, they are very cheap and good insurance to prevent irritating failure down the road.
once you install the engine, run some citric acid through the cooling system to derust everything and fill coolant mix.
Once sorted out these are indestructible cars.
btw - love the original black background you painted on the valve cover logo - Its actually how its supposed to be!