1966 Baldwin Chevelle Motion??

[pibohmark]

Hi Guys, I am new to the board and need a little help. I recently went to an estate auction and purchased a pretty nice 1966 Chevelle SS with 38,500 miles. I bought the car from the family of the original owner and there are quite a few receipts from the maintenance of the car thru its life and the receipts and their dates seem to lend credibility to the actual mileage.

The car has the original window sticker from Baldwin Chevrolet and a rather curious receipt from the same dealer for the installation of a 427 engine at the time of purchase. I have ran the numbers on the engine and it does match up to the correct year (1966) motor. The car has 427 emblems where the 396 should be.

There is also a receipt for the sale of the original 396 engine several months later to another individual. The car is straight and appears to be all original except the washer bottle is missing.

What I am looking for is some opinions as to weather or not I am better off doing a frame off and putting the 396 back in or leaving it as a 427. From the receipts and the documentation that goes along with it, the car and the engine were ordered from GM on the same dates. The engine appears to have arrived 3 weeks prior to the car and the service order is date three days after the delivery date of the car.

Any help would be greatly appreciated. Thanks