How to identify my engine?

[ChargerST]

Here's the deal: when I bough my Charger the previous owner didn't know anything about the engine as he also bought it that way. He just told me that the engine was rebuilt by some shop. I want to know how I can identify the internals without ripping the engine apart - or at least get a general idea what kind of engine I have.

Here are the things I do know:
#block 440 (70 Charger).
915 closed chamber heads
large cam (no specs but rough idle) - hydraulic as the engine still has the factory rockers

Is there any way to determine the compression ratio or the cam specs?

[RallyeMike]

The easiest way would be to try and back track to the builder.

There is no easy way to determine complete cam specs without a tear down or getting a number off the cam. There is no way to tell piston compression ratio without a disassemble, though overall final compression ratio can be estimated by a compression test. 

[ChargerST]

I was thinking about using an endoscope camera through the spark plug hole to find out how deep the pistons sit in the hole. I doubt that they used a different crank.

[ACUDANUT]

 It should have 946 heads  .
If it runs well, sleep peacefully and not worry about it.