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I am going to run the Felpro 1009 .039" head gasket. Thanks for all the advice, it really helps.

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Make sure the fire ring on the 1009 does not hang into the combustion chamber once it is compressed from torqueing If it does it can cause severe damage from detonation Two ways to check, one is with the pistons not in the motor, install the heads,both, with the gaskets torque down and look into the cylinders from the bottom of the motor to see if the fire ring is compressed into the cylinder, the other way is to torque them down and then remove them and lay them on the deck and cylinder heads to see if they protrude into the combustion chamber or not. If they do get a gasket with a bigger diameter The 1009 are famous for this Evidently they where designed for the 4.250 bores like the 426 wedge and 383 motors are Don't forget about the fire ring requirements for the reciever groove on the 1009 also IHTHs The 8517 PT might be a better gasket for you,depending on the bore size