[Average Joe]

If all thats wrong with your motor is a blown head gasket why not just replace them? You can purchase a no name gasket set from Summit for 30 bucks. This includes all the gaskets you will need to do the job. You will also need a tube of RTV, 2-3 gallons of antifreeze, gasket scraper and basic hand tools which you probably already own. Borrow a torque wrench from a friend or rent one if you dont already own one. You might also consider buying a overhaul manual for a SBC. David Vizard's "How to rebuild your small block Chevy" is invaluable. This option will get your 'Burb back on the road much quicker and allow you to save up money for doing the Big Block swap right. As for keeping it original do what you want. Its your rig. Like Vectorit said hang on to the original motor and all is good. When you do swap in the big block consider purchasing a "donor" truck. This way you get all the brackets and other items you may otherwise have to search a junkyard for. Plus you can test drive the vehicle if its in running condition. When you are done with your donor truck part it out or sell it to the junkyard. The brackets may not be period correct for your Suburban but they will function just fine. The factory SB springs will work but will sit 1-2" lower with the big block in place. Consider replacing your driveline with a beefier unit if any mods are required there.You will need at least a 3 core brass radiator or a modern aluminum radiator for cooling. Good luck and keep us posted on your progress.