[214Chevy]

I'm about to pull the trigger on a block (maybe). At first, I was gonna just buy the block unmachined and store it until I was ready to assemble it then get it honed, bored, etc. But, the manufacturer gave me a stellar deal on doing all the machine work plus free shipping if I let them do everything. It's almost too good to pass up. My question is, if I'm not ready to assemble it until 6-12 months how, much of a chance am I taking by letting it sit up and allowing flash rust/condensation, etc to build up. I know if it's a deal today, it'll be another deal tomorrow, so to speak. And I know to keep it wrapped up super tight. I was also told to buy some of those large desiccant gel packs and lay them on the block to keep moisture out, but I don't know how well that works for my assumed length of time. So, can any of you guys give me some insight and opinions on this and what should I do? Like, should I just wait right until I'm ready to assemble it.