I planned to tow my Blazer from Virginia to Louisiana with my '88 K1500 truck next Tuesday; however, three days ago the truck blew a head gasket. After removing the heads a one inch "scratch" was discovered in cylinder #7. I can feel the scratch with my fingernail and it's deep enough in the cylinder to make contact with the rings. The machine shop will be able to tell me tomorrow if the "scratch" is a crack that goes through the block. I am the original owner of this 12 year old truck (only 70,000 miles) and I intend to keep it. The heads are in excellent shape. What are my choices for repairing or replacing this motor? Can I have a sleeve put in the bad cylinder? Should I buy a long block or short block. I'm sure some of you have already done this type of shopping before and I'd like to benefit from what you have learned. I can handle the labor involved but I need some direction as to what is the most feasible remedy. Thanks.