Check the date code on the block, it is near the distributor on the block. It will be cast into the block with a series of numbers & a letter to indicate the date. For instance, a code of C138 would be March 13, 1968. If this code is at least 3 to 4 months before the actual build of the car I would say it is the original engine. On '68 & up it's easier to prove originality because part of the VIN # is stamped into the block. Your head casting # is a 2 BBL head. #141's were the 4 BBL casting. The head casting is a 326 engine head.
