heads ready to go on or come with new parts

I need a set of heads for my 96 LT1 I would prefer ready to go on the car if not just needing assembled. I would possibly be interested in some that were not machined yet for the right price so long as they can be guaranteed they have no cracks or warpage so it will cost me less at the machine shop.

Possibly interested in some performance upgraded heads if the price is right.

again cheaper is always better but i am willing to pay some extra coin for the right product.

Thank you,
Trent