As Judistang said, doing a google search can't hurt.
In my experience there are three ways to buy something:
Pick any two.
If it means waiting a couple extra weeks to get a good deal on a quality product, it's worth it.
Confucius say ... Actually, that's pretty inscrutable.
On something of the scale of an engine, I'd be tempted to find a local supplier with a similar product and price, on the grounds that it'll be a lot easier to resolve problems than with some remote business who may or may not be eager to help someone that isn't looking daggers at them across a counter.
Not that I have any experience that would lead me to believe Coast High Performance isn't eager. I have had experience with remote businesses who abandoned their products once I pointed out the shortcomings. rustydisk - a set on Flickr
ADDED: 2014 GT 5.0A conv. black: electronics, comfort, security, CA plate (FLICK U); assembled 06-13-2014, delivered 09-25-2014; odometer today (03-21-2016) 4,321.5(--> DELETED --> 2013 5.06M coupe, black:: Odo LAST day (09-25-2014) 7,975) (--> DELETED --> 2008 GT/CS: Odo LAST day (10-22-2012): 9,719.3; #2075 of 2509 convertibles, #560 of 718 in Ebony. 2009 GT/CS: Odo last day (09-08-2012): 12,000.1; #34 of 1705 coupes, #3 of 377 in Performance White. <-- DELETED <--)