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They supply many repair shops. If you get one, they offer an install kit which has almost everything you would need to install it. They do offer a 'we will rebuild your matching number engine' program. Years ago they had a racing program not sure if they still do.
The shop where I worked used Jasper replacements exclusively. The only exception was when a customer didn't want to spend the money and would ask for a used engine.
Jasper offers a 3 year, 100K miles warranty on their engines and when a shop sells and installs one, Jasper also warrants the labor if the engine has to be covered under their warranty. In most cases a core engine is required or pay a core charge. There are Jasper warehouses all over the country so getting one doesn't take very long, sometimes just a day or two.
Jasper also has a line of performance engines so it may be work checking them out.