So....What is YOUR opinion on VIN swaps ?

OK, new to all this...
Just where can the VIN number be found say like on a '73 Scamp, other than the plate up on the driver side dash.

I got a '73 that was used as a Drag race car for 25 years, pretty much a shell, I believe it was originally a Slat Six but has a V8 'K' member in it now and a Ford 9" in the rear. Please help me, with where I can find and verify the VIN, PLEASE.

Ken