ok so today it was around 10* outside and so i decided to put on my new PLOG from zzp. Anyways the installation was going smoothly until i was torquing down the last manifold stud and then, SNAP! my worst nightmare, the bolt broke off and left the shank inside of the head (the one where the dipstick bolts to). I drove around for a couple of hours to see if i had a leak or not, and luckily i dont. Is there an easy way to get the bolt out or is it a remove the intake manifold and heads project?

P.S. Gen V Top swap is on the way, probably by late spring or summer. Would it be ok to leave in the shank until then?