Can any of my mopar brethren tell me if there are different cases FOR A 727 TRANNY IN A BIG BLOCK VS SMALL BLOCK application?

I have a 318 that Im dropping in an old pickup and I have a 727 tranny that I pulled from my 383 drivetrain and want to use it behind this 318 - but I keep seeing people advertising 727's specifiacally for big blocl OR small block applications.