the VIN number is on the car, it should also be on the title.
the engine would be stamped in different locations depending on big or small block.
to learn where to look check
http://www.nastyz28.com/spmenu.html
will tell you how to find them.
the numbers on the engine at least the last 6 I think it is should match the last 6 digits of the vin for it to be matching numbers, although there are times this is faked to make a vehicle seem more valuable.