Yeah, I saw that one for sale in Ogden... wonder what the condition is, with almost 300k on the car. Could be a good deal if it's in nice shape, and ONLY needs a head gasket. I'd go check it out if it were closer, but they say it's not driveable, and I don't have a way to haul it to Boise economically.
At an indy shop, figure minimum 10-15 hours labor, 15-20 max, for a straight head gasket job. If they find anything else while they're in there, like a bad timing chain, etc that figure could increase. Basic parts shouldn't be too much, most likely under $200, but again if they find other things... could jump to $300-$500 in parts. If fluids mixed, tack on the cost of an oil & coolant flush + change. I'd expect the estimate to come in somewhere between $1200 and $1800, depending on the local labor rate, and the shop's expertise with these engines. If you get a quote, please post details here, I'd love to know the going rate!