Help me understand rebuild vs crate?

Well I appreciate the opinions! I guess if I am willing to drop 5k on a crate engine, dropping 5k on a home built 390 is no more money, just more time and risk..

I looked a lot at stroker kits but I kind of thought that why would I do a 390 for the same price as a 408 from blueprint? But it comes down to “do it yourself” or pay someone else to do it. That is the real decision.
Yep, I think you hit the nail on the head.

Read up on the details of, and think out, any warranty and what you have to do to get the benefits; don't just be mesmerized by the general warranty terms. If it does not cover any of the labor to pull the engine if there are issues (which Blueprint does not do if you install the engine yourself, whole or in part, as it sounds like the OP would do), then one of the biggest parts of dealing with any engine issue is still the purchaser's problem to do or pay for. Then you have to ship it back or take it somewhere. So a warranty is not all that valuable to some, as it can require a lot of work on your own to make any use of it; it is not like a new car warranty. IMHO, if I am pulling the engine, I'd rather just pull it apart myself, diagnose, take it locally for work, re-assemble, and be done with it; I don't have to argue over warranty claim either.

But if you don't want to be inside an engine, or don't want the installation work hassles, or don't have the tools, then you can pay an approved shop the $$ upfront to install it and have the full situation warranted. But the cost just went up considerably.

Here is the Blueprint warranty statement:
https://cdn.shopify.com/s/files/1/2160/9839/files/sm115.pdf?5044347280740304565