Clean the Loctite from allens and use a bottom tap to clean internal threads. If you go to 120 in lbs on the rocker box cover, consider buying 1/4" longer bolts...shorter ones can strip. I use 80-90 in lbs instead. Torque them in at least two phases.
You'll need to buy a rocker box wrench, or grind down an Allen to get the rear Allens, but if you got it apart, you already know about that. You have to torque a couple of the rear Allens by feel.....no room.

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