Daily driver head question

I'm usually a proponent of using new and better heads. But if it's a 383, in MI, and it has to run well in the winter, I think I'd run iron. They should be similar cost or cheaper to do properly, and the 383 will run well on them. If you want to try to build with quench in mind, get a set of 516 closed chambers, stick the 1.74 exh valve when the valve job's done.