Hi Riley.. Nice to see you here! A couple of questions for you.
1. whats the motor going in?
2. what's the purpose - what's your goal?

I'm not certain the heads (1972 truck heads I believe) are going to be helpful if you want to make big rpm. And I don't believe they have hardened seats.
But if you just want to make torque at lower rpm, then maybe they fit your plan...