I personally love the idea. A kit in the box.
Home run as far as I’m concerned. As long as it fits the bill for the build, your in.
I am looking at kits myself. It is the ez button.
Once I get my 340 blocks sonic checked and know exactly where I stand and can go, I’ll order a kit or two.
Just pay attention to the compression ratio with the spec’d Cylinder head cc amount. Also, it is a nice to know of the block needs to be notched with the kit your looking at though once the machinist has it all, it is a simple thing to adjust for. It’s just nice to know ahead of time instead of being a surprise when you get there.
If you have the coin (to anyone considering this move) go to a forged crank set up. Then pistons if so desired. IMO, how I see it is it would be almost crazy not to go with a forged crank.