Have a questiong about 502

[WicKeD_SS]

Hello guys, I have a chance to buy a 502 from a guy that say's it has 800 miles on it. He is asking 5500.00 for it. He states that it has 502 hp but the motor has cast Iron heads..... If im not mistaken the ZZ502 is the 502hp and has alum heads. And the non-zz has cast head's with lower hp. Am I right? Or is there a 502 hp with cast heads? And last question is it worth 5500.00??

I need to give him a call at the end of the week, so I need to find out asap.

Thanks for your help.

-Brian