1970 440 Police Interceptor?

What are your intentions with it? It probably just had a little hotter cam and a little different carb than a standard production engine, if that. Could possibly have a six pack rotating assy. Honestly if the price isn't good I'd look elsewhere if you're looking for a core to build. If it has the "HP" stamp on the block there are people that think and charge at a premium. Where I'm at I can find motor home engines for less than 500. But they are cores. Not something I'm thinking I can just throw in and run. The last one I tore down had six pack rods in it with a forged crank. 440 source has some good info on their web site about different castings etc. hope I've been some help to you as I'm sure others will chime in.
http://www.440source.com/blockinfo.htm