You could measure the cam lobes. The factory service manual describes the difference between garden variety & XFi:
Quote:
XFI Model
Standard camshaft lobe height is 39.628 to 39.788 mm
(1.5602 to 1.5665 inches).
Wear limit 39.528 (1.5562 inches).
Base and LSI Models
Standard camshaft lobe height is 40.415 to 40.575 mm
(1.5911 to 1.5974 inches).
Wear limit 40.315 mm (1.5872 inches)
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As for identifying the transmission final drive, I'm not sure about stamped ID's but one option is to simply turn the input shaft (or engine) and do the math. The gear ratios are out there somewhere.