realistically you can put in any mild 350 with TPI on it and pass emissions as long as you retain all the emissions equipment and have a properly tuned chip in it.
you do not need to shop specifically for an engine that says it is for fuel injection.
if you are looking to purchase a crate motor my suggestion would be to check out
www.SDPC2000.com scoggins-dickey has competitive prices and their tech line is usually pretty helpful.
jsut avoid the edelbrock crate motors, they are good pieces, but a large portion of the price is merely to pay for the name on the valve covers. GMPP are a more economical choice and most come with a 3yr/36k warranty