i would do one bolt at a time in the correct torque sequence. when installing the washer install the beveled edge down. make sure to use the ARP lube. think of this as retorquing the head bolts, which you would have needed to do anyway.
use the ARP torque spec
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1979 Firebird Trans Am 301/4spd (Now 428)
1977 Firebird Formula 400/Auto
2007 Grand Prix GXP 5.3L
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