These days??? Not what they used to go for back in 'the days'..hehe..
But seriously alot depends on exactly what block you have. Many different blocks were produced back then. The most valuable being a production block with an early date.
The same goes for the heads. Dates and condition are everything!!
Post a few pics here or you can send a few pics to my email and I will post
[email protected]. And with more info., I am sure those here will give you an idea and help out.