Isn't that basically why GM came up with the E-rod crate engine, already set up with cats and whatnot to pass the sniffers. It's been a while since I've looked into swaps, but the law used to be the engine is required to be the same year or newer than the chassis it's installed into, with the engine's factory emissions systems in place and functional. Places without state emissions inspections, that's not as big of a deal.Meeting emissions is another challenge.
Personally I don't find it to be a problem, but YMMV.
Make that an LS3 and you really have something.
The LSx engines are so much easier to physically fit in the engine bay of a 3rd gen vs. the Toyota V8s.
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a short block is a block without heads. a small block is the size of a short block. You can have a 454 short block because it would have no heads. but a 454 is a big block chevy engine. Short vs long = without/ with heads. Big vs small block = size of shortblock.