You need the pins back. They hold the gasket and locate the heads. Felpro 1008 care pretty good. Is the intake stock or aftermarket? If aftermarket they all do not have holes for the stock pin on the china wall, this combo can cause install issues. Was the block and/or heads milled?
New head bolts are a good call. If you go ARP follow their directions for a torque spec and lube.
