I wouldn't drive it any further that absolutely necessary, as in like a couple of miles tops. I certainly wouldn't risk getting my family stranded 100 miles from home. Or additional engine damage. Head gaskets by themselves are not that expensive.
If you find it or build another, park it on wet ground and hook an electric fence transformer to it. Good, painful, non-lethal deterrent.the go-kart that I made for my kids was stolen last night
OUCH! :argh:Bad part is, of course every case is different, but I've seen more than one engine run for a period of time with a significant head gskt leak and the escaping combustion gases acted like a cutting torch over time and eroded the head and block so badly at the leak site that both were ruined.