Vintage Cars: 61 Ford F100, casting numbers, lovefords

Question
I was wondering how I can find out if the engine is the original engine or if it has been replaced. Thanks for your time.

Answer
Here is one site with some good info:

http://www.lovefords.org/tech/vinb.htm

that is for the car, here is some info on engines:

http://www.dearbornclassics.com/engine_codes_60-61.html

and here is a good explanation of casting numbers:

http://www.classicmustang.com/decoding_part_numbers.htm

Check the block and heads and also intake for casting numbers and you will be able to tell when it was made.

Don