It is NOT driveable!!! The guts are gone out of the GP and you will have a massive compression leak!!!
Which GP was it; location is important for access without pulling the intake.
Use some real GOOD penetrating oil like PB Blaster or CRC Freeze-Off Super Penetrant
Plug in block heater for a few hours before trying to extract GP. (may help loosen the tension on the threads a little)
You can try an easyout extraction tool, but keep in mind most easyout tools put additional tension on the threads as they are rotated into the cavity!
Left hand drill bit may work if you can get perfectly STRAIGHT on it and it must be an exact size; big enough for the bit to grab it, but small enough not to touch or cut the aluminum head GP threads!
Final option: pull head and take it to a machine shop for extraction!
(if you pull head; I would replace all the exhaust valves and install ARP head studs.)They make a tool kit for removing broken GP's; but if the GP is not accessible you may have to pull the intake to get at it.
(if you have to pull intake, replace all head bolts with ARP head studs and inspect all rockers for wear and replace any that are worn)There are also some YouTube videos you can watch on removing broken GP with the tool set.
Good luck and keep us posted...
Tool kit on Amazon:>
https://www.amazon.com/Generic-Glow-Rem ... ug+removal
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