How much are 360 heads (non magnum) worth

Update for everyone, and thanks everyone for the knowledge. So, the casting numbers are 345, designated as a police 318 head, which to me is totally bizarre that police cars were running around with slightly built up 318s instead of big blocks. Regardless, they both have cracks in them big enough that the machine shop suggested replacing them, so I'm now in the market for new heads and these are worthless as paperweights.