How much would a fully done slant six cylinder head cost?

805moparkid said
also have to machine the valve guides down so they dont hit the retainer, and machine for seals (might as well)

You cut'em yourself.

You can buy the cutter and use a frickin drill motor...
Though thats really cheap for a shop to do as well.

There's a lot more to it than just having a head that flows.

It's never only one thing that makes the cake.