Copo 427 or 454? engine block

Is this for a 427, or 454, or both?? looks nice and not hacked, was wondering if block was used for both size engines, thanks.. thought it was standard and 454, but could be COPO too?

oph, heres a linkhttp://cgi.ebay.com/ebaymotors/ws/eBayISAPI.dll?ViewItem&item=7954810844&rd=1&sspagename=STRK%3AMEWA%3AIT

The COPO motor was a L72 and a ZL1, not the LS6. Its just one of those words they add to get your attention. I wouldnt spend the money on that tho.

The COPO 427 and the 454 both used that casting number..

The difference between a standard 454 and The COPO 427, was that the copo used an all aluminum block..

NO, I know they made a copo with an Iron engine, and the ZL1 was a copo too, but aluminum engine, so this could be a Iron copo block I have to assume