It's no problem at all. So LA cores in the quantities we buy, are simply gone from out suppliers. We make a 408, using a 360 block.
That 408 build is going to change to utilize a magnum block shortly, and will have a PN change. Now the only reason that you couldn't use a magnum based block is if you were only purchasing a short block, and were only interested in using a used set of LA heads....now there are ways to use LA heads...but it's not a super simple change. So, not sure where that leaves us .We cant take consumer cores for a few reasons, so unfortunately that's not a possibility.
Let me know what you think, or the reason you have to have LA.