Another "What's it worth" question
 

I have located a set of 074 casting aluminum heads but they need work. They are bare heads that have had some cracks repaired but the welds have not been ground or cleaned up in any way. They have a 1970 casting date. They need lots of work and I'm trying to decide if they are worth the trouble. I know it's hard to give a value on something you have seen but I thought I would try anyway.
Thanks, James