I'm rebuilding a Holley 4180 that I don't think has been apart since '86. It was really fun getting the original black gaskets off. CRC Gasket Remover isn't all that it's cracked up to be, although it helps one layer at a time...

Now I need to remove the two pressed tamper-proof plugs so I can get to the idle screws. The Holley kit instructions say to center-punch them (no problem), then drill a 3/32 hole through, then an easy-out. But that hardened steel just laughs at any drill I have, and my carbide burrs don't have sharp teeth on the end.

What do you use to get them out without destroying the casting around them?