Surfire way to tell a 289 HP block

[ZUKPJ86@aol.com]

Hi all,
Can anybody recommend a surfire way to tell a bare 289 HP block
from a standard 289?. What are the differences?
It seems Tom Monroe's "How to rebuild a small block Ford" lists the same 
casting numbers for both.

Thanks.....Paul (now at the restoration point of no return)