I don't know the numbers answer to your question, but anything 327/300 Hp and up were double hump heads, not just the 350HP engines. The 350 HP engine I believe would be 2.02" intake valves, the 300 HP was 1.94". Same casting, just machined for different size valve.
Engine block casting number is on driver side rear bellhousing flange of block.
Stamped Engine Application code/suffix is on the passenger front of the block deck, small pad just forward of the driver side head, above the waterpump leg and facing upward.
Transmission stamp on manual trans is top driver side corner right behind the bellhousing-to-transmission mounting face, parallel to the bellhousing face