I'm not aware of any of the crate engines you listed requiring ASE certified installation. The GM for sure doesn't and they also don't put heat seals on their engines, I'm not sure if ATK or Year One use the heat seals but Blueprint does. My biggest complaint with rebuilt crate engines is the fact they are almost always .040" over bore.(even a lot of new block 383's get built with a +.040" bore...) A +.030" bore on used blocks I'm ok with. Blocks that HAVE to go +.040" from std. I'm not interested in at all, it's been beat like a stolen rental mule.
I really never gave my warrantee any consideration. But I will say almost all crate engine horror stories on the net have the same theme, denial of warrantee coverage due to minor oversites in paperwork, major hurdles to jump over for coverage, having to take it to a mechanic of their choosing for diagnostics(You foot the bill if they deny coverage) or in the case of Blueprint, having to ship engines back to them and when they deny the claim the shipping is all on you. I haven't heard of any issues with ATK or Year One and I don't personally know anyone who has had either.
I will say I've never been disappointed with a GM Performance Parts crate or the regular old Goodwrench crates. The draw back with my crate engine is no roller cam provision and cast pistons.
The ATK does look like a good buy. You get the Vortec heads, roller cam setup and Hypereutectic pistons which are a plus. The only downside for me is the over bore, and they could machine the heads for a more aggressive cam. You don't have to worry about any cam break in procedures all you have to break in are the rings.
You do have to get the heads reworked to go with a more aggressive cam but it's not too expensive to have done.A little head work and a new cam and you can be at or over the 400 hp mark.
Just be sure your coolant system is clean and in good condition when you do the swap, corrosion in the radiator, hoses, heater core and water pump will spread quickly to a new block.