Slant 6 225 valve adjustment

As far as I know, all aftermarket head gaskets for the slant, are no retorque. The factory type steel shim gasket should be retorqued. That said, it would not hurt anything to take off the valve cover, and retorque the head, and reset the valve lash, at around 1,000 mile mark. Cheap insurance.
PS: I have some NOS OEM steel shim head gaskets for sale.