340 & 360 Cylinder head CC specs

MOPAROFFICIAL said

72cc chamber, 155-160cc intake port
90's cc exhaust port

Its 894, 974, ... i think you mixed up 974/596

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These are the pictures of the heads that I have. I found a guide to Mopar V8 Cylinder Heads and Block Casting Numbers, it indicates the following 3418915 – 1970, 340 LA-series small-block, 2.02/1.60 valves, 63cc-73.5cc, T/A. I am assuming the 63cc is the standard head and the 73 would be the T/A