identify the year of my 360 long block

LA family differences: 360 crank main journals are bigger, main bearings are bigger, mains bore in the block is bigger, pistons are bigger than 318 and smaller than 340 and wrist pin is closer to piston head, Harmonic dampener is counter weighted, heads have bigger ports and valves, intake and exhaust manifolds have bigger ports to match the heads, oil pan and its rubber seals are different size. Things that are the same are; connecting rods and rod bearings, windage tray, fuel pump, water pump, timing cover, timing sprockets and chain, oil slinger, camshaft, lifters, rocker arms and shafts, cam bearings, oil pump, intermediate shaft, distributor, engine bolts, valve springs, valve covers, starter.

The 360 LA parts all interchange in all years. This changed with the introduction of the 5.9 magnum which uses different heads, valvetrain, cam, lifters, valve covers, intake manifold. The crank/rods/bearings, pistons, oil pump, intermediate shaft, distributor are the same. as is the timing chain and sprockets. I'm not sure if the water pump and timing covers are the same or not.