Chris,
Unfortunately DART produces the blocks in batches, so we'll go from good supply to supply from our inventory to times where we're waiting on the next batch. Race parts aren't mass air meters, sometimes they take a little bit of time and most sources don't have 20 of them sitting around.
I had two 8.2/4.0 blocks here, 1 was used for a build and the other was shipped to a thief in FL in the first two weeks of November. The block that was paid for with fraudulent funds was actually recovered yesterday so if you're dying for a block I can have it shipped instead of returning it here.
As was stated above they do have the 4.125" bore but if I recall that wasn't an option for you.
If you want to pay about $300 more then you might find one at a local warehouse (Heck, I could do an iron eagle for that immediately) but anyone who gets one from DART will be behind the 6+ that I have ordered.
I'm sorry that things weren't available as soon as you, and I, would have hoped but short of paying more $ we're the LARGEST SBF Sportsman dealer in the world and will work on getting you a block as soon as we can.
Brian
ADP