340 #'s

Mrmopartech,

Vehicle:
VIN- LM23HOR156897
Build Date: A28 (October 28, 1969)

Engine:
Cast Code- 2780930-340-6
Date - 7-10-69 (Seems to make sense for a car build date of October)
No other numbers are stamped on the block above the oil pan or under the head on the drivers side.

Tranny:
Serial Number- OR156897 (this is stamped on the tranny)

I would appreciate any help you could give in helping me understand if this is acutally the original engine.