how can you tell the difference between a 283 or 327 engine on a?

Question

1963 chevy does it look different?

Answer 1

http://www.mortec.com/

Its difficult to tell. look at the casting # and you will know for sure.

This web site also shows where the # is located

Answer 2

I don't believe any 283's had double hump heads like the 327 did