Missing ID stamp

Dana67Dart said
Found this. isn't a 383 a B so it would be on the rail infront if the intake

"Locate the engine ID boss. If the ID boss is located on the block's right side just below the cylinder head next to the distributor base, then the engine has an RB (Golden Lion) block; if the ID boss is located on top of the block directly in front of the intake manifold valley, then the engine is a B block"

This image shows the reverse?

View attachment 1715602490

That picture is correct for big blocks.

You really couldn't have narrowed it down a whole lot if the information was still on the pad anyway, as they didn't have the partial VIN above the pan rail until some time in 68 I believe. So, the only thing you will have to go on is whatever the cast in date code says.